diff --git a/rootfs/usr/local/bin/autogain1090 b/rootfs/usr/local/bin/autogain1090
index e9ef28d..81d17d8 100755
--- a/rootfs/usr/local/bin/autogain1090
+++ b/rootfs/usr/local/bin/autogain1090
@@ -149,7 +149,7 @@ fi
 
 gain="${gain_array[$gain_index]}"
 
-if (( $gain_index < 0 )); then
+if (( gain_index < 0 )); then
     echo "Could have used some lower gain, but gain already at minimum! ($reason)"
     exit 0
 fi