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-rw-r--r--include/gwin.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/gwin.h b/include/gwin.h
index 79b8371c..37fecab4 100644
--- a/include/gwin.h
+++ b/include/gwin.h
@@ -66,7 +66,7 @@
/* Low Level Driver details and error checks. */
/*===========================================================================*/
-#if !defined(GFX_USE_GDISP)
+#if !defined(GFX_USE_GDISP) || !GFX_USE_GDISP
#error "GWIN: GFX_USE_GDISP must also be defined"
#endif
#include "gdisp.h"