diff --git a/include/clang/AST/DeclBase.h b/include/clang/AST/DeclBase.h
index 72f82aa..4ed4b1a 100644
--- a/include/clang/AST/DeclBase.h
+++ b/include/clang/AST/DeclBase.h
@@ -260,6 +260,9 @@
   /// are regarded as "referenced" but not "used".
   unsigned Referenced : 1;
 
+  /// \brief Whether statistic collection is enabled.
+  static bool StatisticsEnabled;
+
 protected:
   /// Access - Used by C++ decls for the access specifier.
   // NOTE: VC++ treats enums as signed, avoid using the AccessSpecifier enum
@@ -304,7 +307,7 @@
       IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
       HasCachedLinkage(0)
   {
-    if (Decl::CollectingStats()) add(DK);
+    if (StatisticsEnabled) add(DK);
   }
 
   Decl(Kind DK, EmptyShell Empty)
@@ -314,7 +317,7 @@
       IdentifierNamespace(getIdentifierNamespaceForKind(DK)),
       HasCachedLinkage(0)
   {
-    if (Decl::CollectingStats()) add(DK);
+    if (StatisticsEnabled) add(DK);
   }
 
   virtual ~Decl();
@@ -761,7 +764,7 @@
 
   // global temp stats (until we have a per-module visitor)
   static void add(Kind k);
-  static bool CollectingStats(bool Enable = false);
+  static void EnableStatistics();
   static void PrintStats();
 
   /// isTemplateParameter - Determines whether this declaration is a
diff --git a/include/clang/AST/Stmt.h b/include/clang/AST/Stmt.h
index c81798c..4c92520 100644
--- a/include/clang/AST/Stmt.h
+++ b/include/clang/AST/Stmt.h
@@ -319,17 +319,21 @@
   /// de-serialization).
   struct EmptyShell { };
 
+private:
+  /// \brief Whether statistic collection is enabled.
+  static bool StatisticsEnabled;
+
 protected:
   /// \brief Construct an empty statement.
   explicit Stmt(StmtClass SC, EmptyShell) {
     StmtBits.sClass = SC;
-    if (Stmt::CollectingStats()) Stmt::addStmtClass(SC);
+    if (StatisticsEnabled) Stmt::addStmtClass(SC);
   }
 
 public:
   Stmt(StmtClass SC) {
     StmtBits.sClass = SC;
-    if (Stmt::CollectingStats()) Stmt::addStmtClass(SC);
+    if (StatisticsEnabled) Stmt::addStmtClass(SC);
   }
 
   StmtClass getStmtClass() const {
@@ -347,7 +351,7 @@
 
   // global temp stats (until we have a per-module visitor)
   static void addStmtClass(const StmtClass s);
-  static bool CollectingStats(bool Enable = false);
+  static void EnableStatistics();
   static void PrintStats();
 
   /// dump - This does a local dump of the specified AST fragment.  It dumps the
diff --git a/lib/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index dbb0b6b..10e6125 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -39,8 +39,6 @@
 #define ABSTRACT_DECL(DECL)
 #include "clang/AST/DeclNodes.inc"
 
-static bool StatSwitch = false;
-
 void *Decl::AllocateDeserializedDecl(const ASTContext &Context, 
                                      unsigned ID,
                                      unsigned Size) {
@@ -88,9 +86,9 @@
   }
 }
 
-bool Decl::CollectingStats(bool Enable) {
-  if (Enable) StatSwitch = true;
-  return StatSwitch;
+bool Decl::StatisticsEnabled = false;
+void Decl::EnableStatistics() {
+  StatisticsEnabled = true;
 }
 
 void Decl::PrintStats() {
diff --git a/lib/AST/Stmt.cpp b/lib/AST/Stmt.cpp
index 8b2e353..0deaaa8 100644
--- a/lib/AST/Stmt.cpp
+++ b/lib/AST/Stmt.cpp
@@ -78,11 +78,9 @@
   ++getStmtInfoTableEntry(s).Counter;
 }
 
-static bool StatSwitch = false;
-
-bool Stmt::CollectingStats(bool Enable) {
-  if (Enable) StatSwitch = true;
-  return StatSwitch;
+bool Stmt::StatisticsEnabled = false;
+void Stmt::EnableStatistics() {
+  StatisticsEnabled = true;
 }
 
 Stmt *Stmt::IgnoreImplicit() {
diff --git a/lib/Parse/ParseAST.cpp b/lib/Parse/ParseAST.cpp
index 7e087ef..2366891 100644
--- a/lib/Parse/ParseAST.cpp
+++ b/lib/Parse/ParseAST.cpp
@@ -53,8 +53,8 @@
 void clang::ParseAST(Sema &S, bool PrintStats) {
   // Collect global stats on Decls/Stmts (until we have a module streamer).
   if (PrintStats) {
-    Decl::CollectingStats(true);
-    Stmt::CollectingStats(true);
+    Decl::EnableStatistics();
+    Stmt::EnableStatistics();
   }
 
   // Also turn on collection of stats inside of the Sema object.