diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index adba8f19894a8..46d05b9d5d2f7 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -543,6 +543,9 @@ pub fn std_cargo(
         // `MACOSX_DEPLOYMENT_TARGET`, `IPHONEOS_DEPLOYMENT_TARGET`, etc.
         let mut cmd = builder.rustc_cmd(cargo.compiler());
         cmd.arg("--target").arg(target.rustc_target_arg());
+        // FIXME(#152709): -Zunstable-options is to handle JSON targets.
+        // Remove when JSON targets are stabilized.
+        cmd.arg("-Zunstable-options").env("RUSTC_BOOTSTRAP", "1");
         cmd.arg("--print=deployment-target");
         let output = cmd.run_capture_stdout(builder).stdout();
 
diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index e3fa826c45af3..6612ae5f19b44 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -773,6 +773,10 @@ impl Builder<'_> {
                         .rustc_cmd(compiler)
                         .arg("--target")
                         .arg(target.rustc_target_arg())
+                        // FIXME(#152709): -Zunstable-options is to handle JSON targets.
+                        // Remove when JSON targets are stabilized.
+                        .arg("-Zunstable-options")
+                        .env("RUSTC_BOOTSTRAP", "1")
                         .arg("--print=file-names")
                         .arg("--crate-type=proc-macro")
                         .arg("-")