diff --git a/webif/html/browse/crop/crop.jim b/webif/html/browse/crop/crop.jim
index 4eb86fc..f717956 100755
--- a/webif/html/browse/crop/crop.jim
+++ b/webif/html/browse/crop/crop.jim
@@ -37,7 +37,7 @@ puts "<div style=\"position: relative; top: -10px\">"
 
 proc div {type left right} {
 	set width $($right - $left)
-	if {width < 0} {
+	if {$width < 0} {
 		# negative values are invalid for CSS width
 		set width 0
 	}