diff --git a/workspace_tools/toolchains/__init__.py b/workspace_tools/toolchains/__init__.py
index ca5b9a24fb..950884a5d6 100644
--- a/workspace_tools/toolchains/__init__.py
+++ b/workspace_tools/toolchains/__init__.py
@@ -325,7 +325,7 @@ class mbedToolchain:
                 elif ext == '.cpp':
                     resources.cpp_sources.append(file_path)
 
-                elif ext == '.h':
+                elif ext == '.h' or ext == '.hpp':
                     if basename(file_path) == "mbed_config.h":
                         self.has_config = True
                     resources.headers.append(file_path)