diff --git a/src/v8abbr.h b/src/v8abbr.h
index 44289687859..3cfcb37c907 100644
--- a/src/v8abbr.h
+++ b/src/v8abbr.h
@@ -100,7 +100,7 @@
 #define V8_OFF_SCRIPT_LENDS \
     V8_OFF_HEAP(V8DBG_CLASS_SCRIPT__LINE_ENDS__OBJECT)
 #define V8_OFF_STR_LENGTH \
-    V8_OFF_HEAP(V8DBG_CLASS_STRING__LENGTH__SMI)
+    V8_OFF_HEAP(V8DBG_CLASS_STRING__LENGTH__INT32_T)
 #define V8_OFF_STR_CHARS  \
     V8_OFF_HEAP(V8DBG_CLASS_SEQONEBYTESTRING__CHARS__CHAR)
 #define V8_OFF_CONSSTR_CAR  \