diff --git a/lib/path.cpp b/lib/path.cpp
index 5a30aa410..4ef2f43e1 100644
--- a/lib/path.cpp
+++ b/lib/path.cpp
@@ -140,7 +140,8 @@ std::string Path::getFilenameExtensionInLowerCase(const std::string &path)
 
 bool Path::isC(const std::string &path)
 {
-    const std::string extension = getFilenameExtensionInLowerCase(path);
+    // In unix, ".C" is concidered C++ file
+    const std::string extension = getFilenameExtension(path);
     if (extension == ".c") {
         return true;
     }
@@ -160,6 +161,11 @@ bool Path::isCPP(const std::string &path)
         return true;
     }
 
+    // In unix, ".C" is concidered C++ file
+    if (getFilenameExtension(path) == ".C") {
+        return true;
+    }
+
     return false;
 }
 
diff --git a/test/testpath.cpp b/test/testpath.cpp
index 75f98344c..c80e6ba83 100644
--- a/test/testpath.cpp
+++ b/test/testpath.cpp
@@ -82,11 +82,16 @@ private:
         ASSERT(Path::isC("c")==false);
         ASSERT(Path::isC("index.c"));
         ASSERT(Path::isC("C:\\foo\\index.c"));
-        ASSERT(Path::isC("C:\\foo\\index.C"));
+
+        // In unix .C is considered C++
+        ASSERT(Path::isC("C:\\foo\\index.C")==false);
     }
 
     void is_cpp() {
         ASSERT(Path::isCPP("index.c")==false);
+
+        // In unix .C is considered C++
+        ASSERT(Path::isCPP("index.C"));
         ASSERT(Path::isCPP("index.cpp"));
         ASSERT(Path::isCPP("C:\\foo\\index.cpp"));
         ASSERT(Path::isCPP("C:\\foo\\index.Cpp"));