diff --git a/platformio/builder/scripts/frameworks/mbed.py b/platformio/builder/scripts/frameworks/mbed.py
index 0ae6cf47..e300d5f2 100644
--- a/platformio/builder/scripts/frameworks/mbed.py
+++ b/platformio/builder/scripts/frameworks/mbed.py
@@ -125,6 +125,7 @@ def add_mbedlib(libname, libar):
         print (
             "Warning: %s board doesn't have native support for '%s' library!" %
             (env.get("BOARD"), libname), file=sys.stderr)
+        return
 
     env.Append(
         LIBPATH=[