diff --git a/packages/compiler-sfc/src/parse.ts b/packages/compiler-sfc/src/parse.ts
index 60ee4b654d5..1c75450213d 100644
--- a/packages/compiler-sfc/src/parse.ts
+++ b/packages/compiler-sfc/src/parse.ts
@@ -279,8 +279,8 @@ export function parse(
     }
     genMap(descriptor.template, templateColumnOffset)
     genMap(descriptor.script)
-    descriptor.styles.forEach(genMap)
-    descriptor.customBlocks.forEach(genMap)
+    descriptor.styles.forEach(s => genMap(s))
+    descriptor.customBlocks.forEach(s => genMap(s))
   }
 
   // parse CSS vars