diff --git a/tests-pl/issue_delete_directory.pl b/tests-pl/issue_delete_directory.pl
index 6e422d944..9543c3120 100644
--- a/tests-pl/issue_delete_directory.pl
+++ b/tests-pl/issue_delete_directory.pl
@@ -21,7 +21,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_DIRECTORY", "delete_directory_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_DIRECTORY", "delete_directory_test"),
         shell("mkdir delete_directory_test", 0),
         check),
         shell("test -d delete_directory_test && rmdir delete_directory_test || true", 0)
diff --git a/tests-pl/issue_delete_file.pl b/tests-pl/issue_delete_file.pl
index b75a2e69f..64dd63a06 100644
--- a/tests-pl/issue_delete_file.pl
+++ b/tests-pl/issue_delete_file.pl
@@ -21,7 +21,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_FILE", "delete_file_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_FILE", "delete_file_test"),
         shell("touch delete_file_test", 0),
         check),
         shell("test -e delete_file_test && rm delete_file_test || true", 0)
diff --git a/tests-pl/issue_directory_files.pl b/tests-pl/issue_directory_files.pl
index 2f5a8e34b..914b0d3c1 100644
--- a/tests-pl/issue_directory_files.pl
+++ b/tests-pl/issue_directory_files.pl
@@ -16,7 +16,8 @@
 main :-
     path_segments(Path, ["directory_files_test_parent", "directory_files_test_file"]),
     call_cleanup(
-       (setenv("TARGET_DIRECTORY", "directory_files_test_parent"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_DIRECTORY", "directory_files_test_parent"),
         shell("test -d directory_files_test_parent || mkdir directory_files_test_parent", 0),
         append(["test -e ", Path, " || touch ", Path], Cmd),
         shell(Cmd, 0),
diff --git a/tests-pl/issue_file_copy.pl b/tests-pl/issue_file_copy.pl
index 21b404ea1..02ae3c860 100644
--- a/tests-pl/issue_file_copy.pl
+++ b/tests-pl/issue_file_copy.pl
@@ -26,7 +26,8 @@
 
 main :-
     call_cleanup(
-       (setenv("SOURCE", "file_copy_test_source"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("SOURCE", "file_copy_test_source"),
         setenv("DESTINATION", "file_copy_test_destination"),
         shell("touch file_copy_test_source", 0),
         check),
diff --git a/tests-pl/issue_file_exists.pl b/tests-pl/issue_file_exists.pl
index 27a72c5d9..b1f6eefa0 100644
--- a/tests-pl/issue_file_exists.pl
+++ b/tests-pl/issue_file_exists.pl
@@ -16,7 +16,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_FILE", "file_exists_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_FILE", "file_exists_test"),
         shell("touch file_exists_test", 0),
         check),
         shell("rm -f file_exists_test", 0)
diff --git a/tests-pl/issue_file_size.pl b/tests-pl/issue_file_size.pl
index ef654e5b5..62ec1f325 100644
--- a/tests-pl/issue_file_size.pl
+++ b/tests-pl/issue_file_size.pl
@@ -14,7 +14,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_FILE", "file_size_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_FILE", "file_size_test"),
         shell("echo '1' > file_size_test", 0),
         check),
         shell("rm -f file_size_test", 0)
diff --git a/tests-pl/issue_file_time.pl b/tests-pl/issue_file_time.pl
index 98e05ac46..febeb2692 100644
--- a/tests-pl/issue_file_time.pl
+++ b/tests-pl/issue_file_time.pl
@@ -16,7 +16,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_FILE", "file_time_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_FILE", "file_time_test"),
         shell("touch file_time_test", 0),
         findall(T, check(T), Ts),
         length(Ts, 3)),
diff --git a/tests-pl/issue_make_directory.pl b/tests-pl/issue_make_directory.pl
index 79ba06484..3cac6d32b 100644
--- a/tests-pl/issue_make_directory.pl
+++ b/tests-pl/issue_make_directory.pl
@@ -21,7 +21,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_DIRECTORY", "make_directory_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_DIRECTORY", "make_directory_test"),
         check),
         shell("test -d make_directory_test && rmdir make_directory_test || true", 0)
     ).
diff --git a/tests-pl/issue_make_directory_path.pl b/tests-pl/issue_make_directory_path.pl
index f8d1ace6b..6b312f2de 100644
--- a/tests-pl/issue_make_directory_path.pl
+++ b/tests-pl/issue_make_directory_path.pl
@@ -21,7 +21,8 @@
 
 main :-
     call_cleanup(
-       (setenv("TARGET_DIRECTORY", "make_directory_test/subdir"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_DIRECTORY", "make_directory_test/subdir"),
         check),
        (shell("test -d make_directory_test/subdir && rmdir make_directory_test/subdir || true", 0),
         shell("test -d make_directory_test && rmdir make_directory_test || true", 0))
diff --git a/tests-pl/issue_path_canonical.pl b/tests-pl/issue_path_canonical.pl
index fc048b226..df5e95d37 100644
--- a/tests-pl/issue_path_canonical.pl
+++ b/tests-pl/issue_path_canonical.pl
@@ -18,7 +18,8 @@
 main :-
     path_segments(Path, ["path_canonical_test", "..", "path_canonical_test"]),
     call_cleanup(
-       (setenv("TARGET_PATH", Path),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("TARGET_PATH", Path),
         shell("mkdir path_canonical_test", 0),
         check),
        shell("test -d path_canonical_test && rmdir path_canonical_test || true", 0)
diff --git a/tests-pl/issue_rename_file.pl b/tests-pl/issue_rename_file.pl
index b86d1d474..4b1ba1e80 100644
--- a/tests-pl/issue_rename_file.pl
+++ b/tests-pl/issue_rename_file.pl
@@ -22,7 +22,8 @@
 
 main :-
     call_cleanup(
-       (setenv("SOURCE", "rename_file_test"),
+       (setenv("SHELL", "/bin/sh"),
+        setenv("SOURCE", "rename_file_test"),
         setenv("DESTINATION", "rename_file_test_renamed"),
         shell("touch rename_file_test", 0),
         check),
diff --git a/tests/scryer/issues.rs b/tests/scryer/issues.rs
index cb3217464..6145205fc 100644
--- a/tests/scryer/issues.rs
+++ b/tests/scryer/issues.rs
@@ -55,6 +55,10 @@ fn issue2725_dcg_without_module() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_delete_directory() {
     load_module_test("tests-pl/issue_delete_directory.pl", "directory_deleted");
 }
@@ -62,6 +66,10 @@ fn issue_delete_directory() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_delete_file() {
     load_module_test("tests-pl/issue_delete_file.pl", "file_deleted");
 }
@@ -76,6 +84,10 @@ fn issue_directory_exists() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_directory_files() {
     load_module_test("tests-pl/issue_directory_files.pl", "1");
 }
@@ -83,6 +95,10 @@ fn issue_directory_files() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_file_copy() {
     load_module_test("tests-pl/issue_file_copy.pl", "file_copied");
 }
@@ -90,6 +106,10 @@ fn issue_file_copy() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_file_exists() {
     load_module_test("tests-pl/issue_file_exists.pl", "");
 }
@@ -97,6 +117,10 @@ fn issue_file_exists() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_file_size() {
     load_module_test("tests-pl/issue_file_size.pl", "");
 }
@@ -104,6 +128,10 @@ fn issue_file_size() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_file_time() {
     load_module_test("tests-pl/issue_file_time.pl", "");
 }
@@ -111,6 +139,10 @@ fn issue_file_time() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_make_directory() {
     load_module_test("tests-pl/issue_make_directory.pl", "directory_made");
 }
@@ -118,6 +150,10 @@ fn issue_make_directory() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_make_directory_path() {
     load_module_test(
         "tests-pl/issue_make_directory_path.pl",
@@ -128,6 +164,10 @@ fn issue_make_directory_path() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_path_canonical() {
     load_module_test("tests-pl/issue_path_canonical.pl", "path_canonicalized");
 }
@@ -135,6 +175,10 @@ fn issue_path_canonical() {
 #[serial]
 #[test]
 #[cfg_attr(miri, ignore = "it takes too long to run")]
+#[cfg_attr(
+    not(unix),
+    ignore = "uses shell/2 and it's not portable outside of POSIX"
+)]
 fn issue_rename_file() {
     load_module_test("tests-pl/issue_rename_file.pl", "file_renamed");
 }