diff --git a/vcsh b/vcsh
index 6a81343cf8ec188b1a8aeda2fe6495afb51cd85a..0b4c45269d7cc30b862256ccd98cf5b74b99758e 100755
--- a/vcsh
+++ b/vcsh
@@ -351,6 +351,7 @@ use() {
 }
 
 which() {
+	[ -e "$VCSH_COMMAND_PARAMETER" ] || fatal "'$VCSH_COMMAND_PARAMETER' does not exist" 1
 	for VCSH_REPO_NAME in $(list); do
 		for VCSH_FILE in $(get_files); do
 			echo "$VCSH_FILE" | grep -q "$VCSH_COMMAND_PARAMETER" && echo "$VCSH_REPO_NAME: $VCSH_FILE"