diff --git a/config b/config
index 0d1e1bdc..c04165c4 100755
--- a/config
+++ b/config
@@ -278,7 +278,7 @@ if [ "$1" = "" ]; then
 
 	FILE=/home/pi/CubeSatSim/failure_mode.txt
 	if [ -f "$FILE" ]; then
-		if [[ $(grep '-1' $FILE) ]]; then
+		if [[ $(grep "-1" $FILE) ]]; then
 			echo "No simulated failure"
 		else
 			fail=$(<$FILE)