diff --git a/pykd/livevar.cpp b/pykd/livevar.cpp
index c3d0718..3996b80 100644
--- a/pykd/livevar.cpp
+++ b/pykd/livevar.cpp
@@ -21,12 +21,15 @@ struct addLocals {
     ULONG m_rva;
     Ctx::ContextPtr m_ctx;
     IDebugClient4 *m_client;
+    ULONG m_formalNameCounter;
 
     void append(pyDia::SymbolPtr symParent);
 
 private:
     void appendVar(pyDia::SymbolPtr symData);
 
+    void generateUniqueName(std::string &varName);
+
     TypedVarPtr getTypeVarByOffset(
         pyDia::SymbolPtr symData,
         ULONG64 varOffset
@@ -81,6 +84,10 @@ void addLocals::appendVar(pyDia::SymbolPtr symData)
 
     std::string varName = symData->getName();
 
+    // check name for unique. f.e. may be may be somewhat parameters
+    // with name "__formal"
+    generateUniqueName(varName);
+
     switch (symData->getLocType())
     {
     case LocIsStatic:
@@ -107,6 +114,22 @@ void addLocals::appendVar(pyDia::SymbolPtr symData)
 
 ////////////////////////////////////////////////////////////////////////////////
 
+void addLocals::generateUniqueName(std::string &varName)
+{
+    if ( !m_locals.has_key(varName) )
+        return;
+
+    std::string origVarName = varName;
+    while ( m_locals.has_key(varName) )
+    {
+        std::stringstream sstream;
+        sstream << origVarName << ++m_formalNameCounter;
+        varName = sstream.str();
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 TypedVarPtr addLocals::getTypeVarByOffset(
     pyDia::SymbolPtr symData,
     ULONG64 varOffset
@@ -176,7 +199,7 @@ python::dict DebugClient::getLocals(Ctx::ContextPtr ctx OPTIONAL)
         return python::dict();  // out of function debug range
 
     python::dict locals;
-    impl::addLocals Locals = { locals, mod, rva, ctx, m_client };
+    impl::addLocals Locals = { locals, mod, rva, ctx, m_client, 0 };
 
     Locals.append(symFunc);
 
diff --git a/test/scripts/diatest.py b/test/scripts/diatest.py
index 251885c..1287a50 100644
--- a/test/scripts/diatest.py
+++ b/test/scripts/diatest.py
@@ -232,7 +232,7 @@ class DiaTest( unittest.TestCase ):
         try:
             gScope = pykd.diaLoadPdb( str(target.module.pdb()) )
             self.assertEqual( pykd.DataIsGlobal, gScope["g_structTest"].dataKind() )
-            self.assertEqual( pykd.DataIsParam, gScope["EnumWindowsProc"]["hWindow"].dataKind() )
+            self.assertEqual( pykd.DataIsParam, gScope["EnumWindowsProc1"]["hWindow"].dataKind() )
         except pykd.DiaException as diaExcept:
             print diaExcept
             self.assertTrue(False)
diff --git a/test/scripts/localstest.py b/test/scripts/localstest.py
index bf3adab..4d9e3df 100644
--- a/test/scripts/localstest.py
+++ b/test/scripts/localstest.py
@@ -6,13 +6,13 @@ import pykd
 
 class LocalVarsTest(unittest.TestCase):
     def testLocalVariable(self):
-        """Start new process and break in targetapp!EnumWindowsProc"""
+        """Start new process and test local variables"""
 
         testClient = pykd.createDbgClient()
         testClient.startProcess( target.appPath + " -testEnumWindows" )
 
         testClient.go() # initial breakpoint -> wmain
-        testClient.go() # wmain -> targetapp!EnumWindowsProc
+        testClient.go() # wmain -> targetapp!EnumWindowsProc1
         # pykd.dprint( "\n" + testClient.dbgCommand("u") )
 
         locals = testClient.getLocals()
@@ -30,3 +30,10 @@ class LocalVarsTest(unittest.TestCase):
         self.assertEqual( pykd.DataIsStaticLocal, locals["staticVar"].dataKind() )
 
         self.assertEqual( locals["dwProccessId"] + 1, locals["staticVar"] )
+
+        testClient.go() # targetapp!EnumWindowsProc1 -> targetapp!EnumWindowsProc2
+        locals = testClient.getLocals()
+        self.assertEqual( len(locals), 2 )
+        locValues = locals.values()
+        self.assertTrue( locValues[0] == 7 or locValues[1] == 7 )
+
diff --git a/test/targetapp/targetapp.cpp b/test/targetapp/targetapp.cpp
index e98afe4..1c90f24 100644
--- a/test/targetapp/targetapp.cpp
+++ b/test/targetapp/targetapp.cpp
@@ -259,7 +259,7 @@ void FuncWithName1(int a)
 
 ////////////////////////////////////////////////////////////////////////////////
 #pragma optimize("g", off)
-BOOL CALLBACK EnumWindowsProc(
+BOOL CALLBACK EnumWindowsProc1(
     HWND hWindow,
     const LPARAM lParam
 )
@@ -278,6 +278,15 @@ BOOL CALLBACK EnumWindowsProc(
     }
     return hWindow ? FALSE : TRUE;
 }
+
+////////////////////////////////////////////////////////////////////////////////
+
+BOOL CALLBACK EnumWindowsProc2(HWND, LPARAM)
+{
+    __debugbreak();
+    return FALSE;
+}
+
 #pragma optimize("g", on)
 ////////////////////////////////////////////////////////////////////////////////
 
@@ -317,7 +326,8 @@ int _tmain(int argc, _TCHAR* argv[])
 
             if ( !_tcsicmp(argv[1], _T("-testEnumWindows")) )
             {
-                ::EnumWindows(&EnumWindowsProc, 6);
+                ::EnumWindows(&EnumWindowsProc1, 6);
+                ::EnumWindows(&EnumWindowsProc2, 7);
                 return ERROR_SUCCESS;
             }
         }