diff --git a/src/Func.cc b/src/Func.cc
index a29ba27f39..695f1dadb9 100644
--- a/src/Func.cc
+++ b/src/Func.cc
@@ -308,7 +308,7 @@ ScriptFunc::~ScriptFunc() {
                 ZVal::DeleteManagedType(cvec[i]);
     }
 
-    delete captures_frame;
+    Unref(captures_frame);
     delete captures_offset_mapping;
 }