diff --git a/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp b/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
index 99082a00ba2791..1cf1247262e099 100644
--- a/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
+++ b/mlir/tools/mlir-linalg-ods-gen/mlir-linalg-ods-yaml-gen.cpp
@@ -471,6 +471,7 @@ std::string convertFunctionKindToEnumName(ScalarFnKind kind) {
   case ScalarFnKind::Type:
     return std::string("TypeFn");
   }
+  llvm_unreachable("unsupported function kind");
 }
 
 //===----------------------------------------------------------------------===//