diff --git a/scripts/update.sh b/scripts/update.sh
index a5ac845d..0d33a8cc 100755
--- a/scripts/update.sh
+++ b/scripts/update.sh
@@ -10,9 +10,9 @@ GLUONDIR="$(pwd)"
 for module in $GLUON_MODULES; do
 	echo "--- Updating module '$module' ---"
 	var=$(echo "$module" | tr '[:lower:]/' '[:upper:]_')
-	eval repo=\$\{"${var}"_REPO\}
-	eval branch=\$\{"${var}"_BRANCH\}
-	eval commit=\$\{"${var}"_COMMIT\}
+	eval 'repo=${'"${var}"'_REPO}'
+	eval 'branch=${'"${var}"'_BRANCH}'
+	eval 'commit=${'"${var}"'_COMMIT}'
 
 	mkdir -p "$GLUONDIR/$module"
 	cd "$GLUONDIR/$module"