diff --git a/Source/JavaScriptCore/ChangeLog b/Source/JavaScriptCore/ChangeLog
index 5b7db0c..00e6bdc 100644
--- a/Source/JavaScriptCore/ChangeLog
+++ b/Source/JavaScriptCore/ChangeLog
@@ -1,5 +1,12 @@
 2019-12-06  Joonghun Park  <jh718.park@samsung.com>
 
+        Unreviewed. Revert r253207 because it causes compile error in Mac and ios build.
+
+        * runtime/PredictionFileCreatingFuzzerAgent.cpp:
+        (JSC::PredictionFileCreatingFuzzerAgent::getPredictionInternal):
+
+2019-12-06  Joonghun Park  <jh718.park@samsung.com>
+
         Unreviewed. Remove build warning below since r252978.
 
         warning: format ‘%llx’ expects argument of type ‘long long unsigned int’,
diff --git a/Source/JavaScriptCore/runtime/PredictionFileCreatingFuzzerAgent.cpp b/Source/JavaScriptCore/runtime/PredictionFileCreatingFuzzerAgent.cpp
index 929783e..319c532 100644
--- a/Source/JavaScriptCore/runtime/PredictionFileCreatingFuzzerAgent.cpp
+++ b/Source/JavaScriptCore/runtime/PredictionFileCreatingFuzzerAgent.cpp
@@ -59,7 +59,7 @@
     case op_call_varargs:
     case op_tail_call:
     case op_tail_call_varargs:
-        dataLogF("%s:%lx\n", predictionTarget.lookupKey.utf8().data(), original);
+        dataLogF("%s:%llx\n", predictionTarget.lookupKey.utf8().data(), original);
         break;
 
     default: