diff --git a/src/checkpkg.in b/src/checkpkg.in
index da4c67b..1a7983c 100644
--- a/src/checkpkg.in
+++ b/src/checkpkg.in
@@ -52,7 +52,7 @@ while (( $# )); do
 			shift
 			break
 			;;
-		-*,--*)
+		-*|--*)
 			die "invalid argument: %s" "$1"
 			;;
 		*)
diff --git a/src/diffpkg.in b/src/diffpkg.in
index 5bae805..b964d44 100644
--- a/src/diffpkg.in
+++ b/src/diffpkg.in
@@ -129,7 +129,7 @@ while (( $# )); do
 			shift
 			break
 			;;
-		-*,--*)
+		-*|--*)
 			die "invalid argument: %s" "$1"
 			;;
 		*)