diff --git a/runtime/native/java_lang_Class.cc b/runtime/native/java_lang_Class.cc
index 1ca98e5..c337e91 100644
--- a/runtime/native/java_lang_Class.cc
+++ b/runtime/native/java_lang_Class.cc
@@ -208,7 +208,7 @@
     }
   }
   if (kIsDebugBuild) {
-    for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields, sizeof(ArtField))) {
+    for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) {
       CHECK_NE(field.GetName(), name->ToModifiedUtf8());
     }
   }