diff --git a/pkgs/development/libraries/gdk-pixbuf/setup-hook.sh b/pkgs/development/libraries/gdk-pixbuf/setup-hook.sh
index 5a7dcd792996..8b6c80867a03 100644
--- a/pkgs/development/libraries/gdk-pixbuf/setup-hook.sh
+++ b/pkgs/development/libraries/gdk-pixbuf/setup-hook.sh
@@ -2,9 +2,9 @@ findGdkPixbufLoaders() {
 
 	# choose the longest loaders.cache
 	local loadersCache="$1/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache"
-	if [ -f "$loadersCache" ]; then
-		if [ -f "$GDK_PIXBUF_MODULE_FILE" ]; then
-			if [ $(cat "$loadersCache"|wc -l) -gt $(cat "$GDK_PIXBUF_MODULE_FILE"|wc -l) ]; then
+	if [[ -f "$loadersCache" ]]; then
+		if [[ -f "${GDK_PIXBUF_MODULE_FILE-}" ]]; then
+			if [[ "$(cat "$loadersCache" | wc -l)" > "$(cat "$GDK_PIXBUF_MODULE_FILE" | wc -l)" ]]; then
 				export GDK_PIXBUF_MODULE_FILE="$loadersCache"
 			fi
 		else