diff --git a/rostests/apitests/w32knapi/w32knapi.c b/rostests/apitests/w32knapi/w32knapi.c
index 0c4b2160dc9..2146be1ad52 100644
--- a/rostests/apitests/w32knapi/w32knapi.c
+++ b/rostests/apitests/w32knapi/w32knapi.c
@@ -87,6 +87,8 @@ WinMain(HINSTANCE hInstance,
 	GdiHandleTable = MyGdiQueryTable();
 	if(!GdiHandleTable)
 	{
+		FreeLibrary(g_hModule);
+		printf("GdiHandleTable not found!\n");
 		return -1;
 	}