diff --git a/src/asm/matcher/mod.rs b/src/asm/matcher/mod.rs
index d70a5b82..747d610a 100644
--- a/src/asm/matcher/mod.rs
+++ b/src/asm/matcher/mod.rs
@@ -433,8 +433,20 @@ pub fn match_instr(
         .collect::<Vec<_>>();
 
 
-    // Identical duplicate matches are already sorted consecutively
-    matches.dedup_by(|a, b| a.is_same(b));
+    // Remove duplicate matches
+    for i in (0..matches.len()).rev()
+    {
+        let mut duplicate = false;
+        for j in 0..i
+        {
+            duplicate |= matches[i].is_same(&matches[j]);
+        }
+
+        if duplicate
+        {
+            matches.remove(i);
+        }
+    }
 
 
     // Calculate recursive "exact" pattern-part count for
diff --git a/tests/issue204/ok.asm b/tests/issue204/ok.asm
new file mode 100644
index 00000000..aac05781
--- /dev/null
+++ b/tests/issue204/ok.asm
@@ -0,0 +1,21 @@
+#ruledef foo
+{
+    f{e:u4}	=> e
+    f{e:u4}+{m:foo}	=> e @ m
+}
+
+#ruledef bar
+{
+    |{f:foo}| => 0xa @ f
+    ){f:foo}( => 0xb @ f
+    ]{f:foo}[ => 0xc @ f
+    ({f:foo}) => 0xd @ f
+    [{f:foo}] => 0xe @ f
+}
+
+f1+f2+f3+f4   ; = 0x1234
+|f1+f2+f3+f4| ; = 0xa1234
+)f1+f2+f3+f4( ; = 0xb1234
+]f1+f2+f3+f4[ ; = 0xc1234
+(f1+f2+f3+f4) ; = 0xd1234
+[f1+f2+f3+f4] ; = 0xe1234
\ No newline at end of file