diff --git a/Source/cmLocalVisualStudioGenerator.cxx b/Source/cmLocalVisualStudioGenerator.cxx
index b2bacca69..53decdf86 100644
--- a/Source/cmLocalVisualStudioGenerator.cxx
+++ b/Source/cmLocalVisualStudioGenerator.cxx
@@ -50,6 +50,61 @@ bool cmLocalVisualStudioGenerator::SourceFileCompiles(const cmSourceFile* sf)
     }
 }
 
+//----------------------------------------------------------------------------
+void cmLocalVisualStudioGenerator::CountObjectNames(
+    const std::vector<cmSourceGroup>& groups,
+    std::map<cmStdString, int>& counts)
+{
+  for(unsigned int i = 0; i < groups.size(); ++i)
+    {
+    cmSourceGroup sg = groups[i];
+    std::vector<const cmSourceFile*> const& srcs = sg.GetSourceFiles();
+    for(std::vector<const cmSourceFile*>::const_iterator s = srcs.begin();
+        s != srcs.end(); ++s)
+      {
+      const cmSourceFile* sf = *s;
+      if(this->SourceFileCompiles(sf))
+        {
+        std::string objectName = cmSystemTools::LowerCase(
+            cmSystemTools::GetFilenameWithoutLastExtension(
+              sf->GetFullPath()));
+        objectName += ".obj";
+        counts[objectName] += 1;
+        }
+      }
+    this->CountObjectNames(sg.GetGroupChildren(), counts);
+    }
+}
+
+//----------------------------------------------------------------------------
+void cmLocalVisualStudioGenerator::InsertNeedObjectNames(
+   const std::vector<cmSourceGroup>& groups,
+    std::map<cmStdString, int>& count)
+{
+  for(unsigned int i = 0; i < groups.size(); ++i)
+    {
+    cmSourceGroup sg = groups[i];
+    std::vector<const cmSourceFile*> const& srcs = sg.GetSourceFiles();
+    for(std::vector<const cmSourceFile*>::const_iterator s = srcs.begin();
+        s != srcs.end(); ++s)
+      {
+      const cmSourceFile* sf = *s;
+      if(this->SourceFileCompiles(sf))
+        {
+        std::string objectName = cmSystemTools::LowerCase(
+           cmSystemTools::GetFilenameWithoutLastExtension(sf->GetFullPath()));
+        objectName += ".obj";
+        if(count[objectName] > 1)
+          {
+          this->NeedObjectName.insert(sf);
+          }
+        }
+      }
+    this->InsertNeedObjectNames(sg.GetGroupChildren(), count);
+    }
+}
+
+
 //----------------------------------------------------------------------------
 void cmLocalVisualStudioGenerator::ComputeObjectNameRequirements
 (std::vector<cmSourceGroup> const& sourceGroups)
@@ -60,50 +115,11 @@ void cmLocalVisualStudioGenerator::ComputeObjectNameRequirements
   // Count the number of object files with each name.  Note that
   // windows file names are not case sensitive.
   std::map<cmStdString, int> objectNameCounts;
-  for(unsigned int i = 0; i < sourceGroups.size(); ++i)
-    {
-    cmSourceGroup sg = sourceGroups[i];
-    std::vector<const cmSourceFile*> const& srcs = sg.GetSourceFiles();
-    for(std::vector<const cmSourceFile*>::const_iterator s = srcs.begin();
-        s != srcs.end(); ++s)
-      {
-      const cmSourceFile* sf = *s;
-      if(this->SourceFileCompiles(sf))
-        {
-        std::string objectName =
-          cmSystemTools::LowerCase(
-            cmSystemTools::GetFilenameWithoutLastExtension(
-              sf->GetFullPath()));
-        objectName += ".obj";
-        objectNameCounts[objectName] += 1;
-        }
-      }
-    }
+  this->CountObjectNames(sourceGroups, objectNameCounts);
 
   // For all source files producing duplicate names we need unique
   // object name computation.
-  for(unsigned int i = 0; i < sourceGroups.size(); ++i)
-    {
-    cmSourceGroup sg = sourceGroups[i];
-    std::vector<const cmSourceFile*> const& srcs = sg.GetSourceFiles();
-    for(std::vector<const cmSourceFile*>::const_iterator s = srcs.begin();
-        s != srcs.end(); ++s)
-      {
-      const cmSourceFile* sf = *s;
-      if(this->SourceFileCompiles(sf))
-        {
-        std::string objectName =
-          cmSystemTools::LowerCase(
-            cmSystemTools::GetFilenameWithoutLastExtension(
-              sf->GetFullPath()));
-        objectName += ".obj";
-        if(objectNameCounts[objectName] > 1)
-          {
-          this->NeedObjectName.insert(sf);
-          }
-        }
-      }
-    }
+  this->InsertNeedObjectNames(sourceGroups, objectNameCounts);
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmLocalVisualStudioGenerator.h b/Source/cmLocalVisualStudioGenerator.h
index 9528fd4ef..64ce01ddf 100644
--- a/Source/cmLocalVisualStudioGenerator.h
+++ b/Source/cmLocalVisualStudioGenerator.h
@@ -46,6 +46,11 @@ protected:
   // Safe object file name generation.
   void ComputeObjectNameRequirements(std::vector<cmSourceGroup> const&);
   bool SourceFileCompiles(const cmSourceFile* sf);
+  void CountObjectNames(const std::vector<cmSourceGroup>& groups,
+                        std::map<cmStdString, int>& count);
+  void InsertNeedObjectNames(const std::vector<cmSourceGroup>& groups,
+                             std::map<cmStdString, int>& count);
+
   std::set<const cmSourceFile*> NeedObjectName;
 };