diff --git a/lld/test/wasm/signature-mismatch-export.ll b/lld/test/wasm/signature-mismatch-export.ll
--- a/lld/test/wasm/signature-mismatch-export.ll
+++ b/lld/test/wasm/signature-mismatch-export.ll
@@ -22,7 +22,7 @@
 ; CHECK-NEXT:     Name:            name
 ; CHECK-NEXT:     FunctionNames:
 ; CHECK-NEXT:       - Index:           0
-; CHECK-NEXT:         Name:            'unreachable:ret32'
+; CHECK-NEXT:         Name:            'signature_mismatch:ret32'
 ; CHECK-NEXT:       - Index:           1
 ; CHECK-NEXT:         Name:            _start
 ; CHECK-NEXT:       - Index:           2
diff --git a/lld/test/wasm/signature-mismatch.ll b/lld/test/wasm/signature-mismatch.ll
--- a/lld/test/wasm/signature-mismatch.ll
+++ b/lld/test/wasm/signature-mismatch.ll
@@ -40,7 +40,7 @@
 ; YAML-NEXT:     Name:            name
 ; YAML-NEXT:     FunctionNames:   
 ; YAML-NEXT:       - Index:           0
-; YAML-NEXT:         Name:            'unreachable:ret32'
+; YAML-NEXT:         Name:            'signature_mismatch:ret32'
 ; YAML-NEXT:       - Index:           1
 ; YAML-NEXT:         Name:            _start
 ; YAML-NEXT:       - Index:           2
diff --git a/lld/wasm/SymbolTable.cpp b/lld/wasm/SymbolTable.cpp
--- a/lld/wasm/SymbolTable.cpp
+++ b/lld/wasm/SymbolTable.cpp
@@ -719,7 +719,7 @@
       if (symbol != defined) {
         auto *f = cast<FunctionSymbol>(symbol);
         reportFunctionSignatureMismatch(symName, f, defined, false);
-        StringRef debugName = saver.save("unreachable:" + toString(*f));
+        StringRef debugName = saver.save("signature_mismatch:" + toString(*f));
         replaceWithUnreachable(f, *f->signature, debugName);
       }
     }