diff --git a/src/disassembler.cc b/src/disassembler.cc
index bb0a072..194a299 100644
--- a/src/disassembler.cc
+++ b/src/disassembler.cc
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -268,10 +268,13 @@
                              Code::Kind2String(kind),
                              CodeStub::MajorName(major_key, false));
             switch (major_key) {
-              case CodeStub::CallFunction:
-                out.AddFormatted("argc = %d", minor_key);
+              case CodeStub::CallFunction: {
+                int argc =
+                    CallFunctionStub::ExtractArgcFromMinorKey(minor_key);
+                out.AddFormatted("argc = %d", argc);
                 break;
-            default:
+              }
+              default:
                 out.AddFormatted("minor: %d", minor_key);
             }
           }