diff --git a/ctest/cblas_test.h b/ctest/cblas_test.h
index 3eeb46ac2c..24ea677637 100644
--- a/ctest/cblas_test.h
+++ b/ctest/cblas_test.h
@@ -10,6 +10,11 @@
 #define int long
 #endif
 
+/* e.g. mingw64/x86_64-w64-mingw32/include/winerror.h */
+#ifdef FAILED
+#undef FAILED
+#endif
+
 #define  TRUE           1
 #define  PASSED         1
 #define  TEST_ROW_MJR	1