diff --git a/lib/path.cpp b/lib/path.cpp
index e5b4caee0..66e7d4a1a 100644
--- a/lib/path.cpp
+++ b/lib/path.cpp
@@ -188,7 +188,8 @@ bool Path::isC(const std::string &path)
 {
     // In unix, ".C" is considered C++ file
     const std::string extension = getFilenameExtension(path);
-    return (extension == ".c");
+    return extension == ".c" ||
+           extension == ".cl";
 }
 
 bool Path::isCPP(const std::string &path)