diff --git a/.github/workflows/test_s390x.yaml b/.github/workflows/test_s390x.yaml
index 71a008e..1e85914 100644
--- a/.github/workflows/test_s390x.yaml
+++ b/.github/workflows/test_s390x.yaml
@@ -29,12 +29,14 @@ jobs:
     - name: Check out code
       uses: actions/checkout@v4
 
+    - name: Test SM2
+      run: go test -v -short ./sm2/...
+      env:
+        GOARCH: ${{ matrix.arch }}   
+  
     - name: Test KDF
       run: go test -v -short ./kdf/...
       env:
         GOARCH: ${{ matrix.arch }}     
-  
-    - name: Test SM2
-      run: go test -v -short ./sm2/...
-      env:
-        GOARCH: ${{ matrix.arch }}       
+ 
+    
diff --git a/kdf/kdf_test.go b/kdf/kdf_test.go
index 58b39ad..3e282aa 100644
--- a/kdf/kdf_test.go
+++ b/kdf/kdf_test.go
@@ -56,9 +56,14 @@ func TestKdfOldCase(t *testing.T) {
 
 func shouldPanic(t *testing.T, f func()) {
 	t.Helper()
-	defer func() { _ = recover() }()
+	defer func() { 
+		t.Helper()
+		err := recover()
+		if err == nil {
+			t.Errorf("should have panicked")
+		}
+	}()
 	f()
-	t.Errorf("should have panicked")
 }
 
 func TestKdfWithSHA256(t *testing.T) {