diff --git a/x11-toolkits/libzvt/Makefile b/x11-toolkits/libzvt/Makefile
index 76f8b54ea063..d8c55d5f4c72 100644
--- a/x11-toolkits/libzvt/Makefile
+++ b/x11-toolkits/libzvt/Makefile
@@ -30,6 +30,6 @@ post-patch:
 	@${FIND} ${WRKSRC} -name "*.[ch]" | ${XARGS} ${REINPLACE_CMD} -e \
 		's|malloc\.h|stdlib.h|g'
 	@${FIND} ${WRKSRC} -name Makefile.in | ${XARGS} ${REINPLACE_CMD} -E -e \
-	    	's|-DG.*_DISABLE_DEPRECATED||g'
+	    	's|-DG[[:alpha:]]*_DISABLE_DEPRECATED||g'
 
 .include <bsd.port.mk>