diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index a49559bff..121e0dfb1 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -1065,6 +1065,8 @@ int cmake::Configure()
     m_GlobalGenerator->ClearEnabledLanguages();
     }
   
+  this->CleanupWrittenFiles();
+
   // actually do the configure
   m_GlobalGenerator->Configure();
   
@@ -1426,3 +1428,8 @@ bool cmake::HasWrittenFile(const char* file)
 {
   return m_WrittenFiles.find(file) != m_WrittenFiles.end();
 }
+
+void cmake::CleanupWrittenFiles()
+{
+  m_WrittenFiles.clear();
+}
diff --git a/Source/cmake.h b/Source/cmake.h
index dc7960472..ccca7bd9b 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -261,6 +261,7 @@ class cmake
   ///! Get the list of files written by CMake using FILE(WRITE / WRITE_FILE
   void AddWrittenFile(const char* file);
   bool HasWrittenFile(const char* file);
+  void CleanupWrittenFiles();
 
 protected:
   typedef cmGlobalGenerator* (*CreateGeneratorFunctionType)();