diff --git a/tdrop b/tdrop
index 32dedce..0c5d978 100755
--- a/tdrop
+++ b/tdrop
@@ -91,8 +91,8 @@ do
 	a) auto_detect_wm=true;;
 	m) monitor_aware=true;;
 	-)
-		OPTION=$(echo "$OPTARG" | awk -F '=' '{print $1}')
-		OPTARG=$(echo "$OPTARG" | awk -F '=' '{print $2}')
+		OPTION=${OPTARG%%=*}
+		OPTARG=${OPTARG#*=}
 		case $OPTION in
 		height) height=$OPTARG;;
 		width) width=$OPTARG;;