diff --git a/src/twtest/fspropcalc_t.cpp b/src/twtest/fspropcalc_t.cpp
index d70bc3f..1e56b4c 100644
--- a/src/twtest/fspropcalc_t.cpp
+++ b/src/twtest/fspropcalc_t.cpp
@@ -75,7 +75,7 @@ void TestFSPropCalc()
     // oh boy! I finally get to test property calculation!
     d.TraceDebug("Creating FCO c:\\temp\\foo.bin\n");
 
-    std::ofstream fstr(foo_bin);
+    std::ofstream fstr(foo_bin.c_str());
     if(fstr.bad())
     {
         d.TraceError("Unable to create test file %s!\n", foo_bin.c_str());
diff --git a/src/twtest/policyparser_t.cpp b/src/twtest/policyparser_t.cpp
index 2353f14..8a5c3c5 100644
--- a/src/twtest/policyparser_t.cpp
+++ b/src/twtest/policyparser_t.cpp
@@ -75,7 +75,7 @@ void test_policy_file(const std::string& polfile)
         pol_path.append(polfile);
         
         std::ifstream in;
-        in.open(pol_path);
+        in.open(pol_path.c_str());
         if( ! in.good() )
             throw eParserHelper( _T("couldn't open test file") );