diff --git a/setup/so-functions b/setup/so-functions
index 217f9f360..d9309f098 100755
--- a/setup/so-functions
+++ b/setup/so-functions
@@ -1873,7 +1873,7 @@ patch_pillar() {
 	printf '%s\n'\
 		"patch:"\
 		"  os:"\
-		"    source: $source"\
+		"    source: '$source'"\
 		"    schedule_name: '$PATCHSCHEDULENAME'"\
 		"    enabled: True"\
 		"    splay: 300"\