1 files changed, 2 insertions, 1 deletions
diff --git a/arg.h b/arg.h
index 6a3f112..9756516 100644
--- a/arg.h
+++ b/arg.h
@@ -1,6 +1,7 @@
 #define ARGBEGIN \
 	for (;;) { \
-		++argv, --argc; \
+		if (argc > 0) \
+			++argv, --argc; \
 		if (argc == 0 || (*argv)[0] != '-') \
 			break; \
 		if ((*argv)[1] == '-' && !(*argv)[2]) { \