diff --git a/griddle b/griddle
index de6ae1b..c6ac025 100755
--- a/griddle
+++ b/griddle
@@ -7,6 +7,11 @@ main() {
 	fi
 
 	inputfile="$1"
+	if ! test -e "$inputfile"; then
+		echo "Input file $inputfile does not exist."
+		return 2
+	fi
+
 	outputfile="$2"
 
 	echo "$inputfile" "$outputfile"