diff --git a/platformio/builder/tools/platformio.py b/platformio/builder/tools/platformio.py
index 0c943319..6e51154d 100644
--- a/platformio/builder/tools/platformio.py
+++ b/platformio/builder/tools/platformio.py
@@ -332,7 +332,7 @@ def BuildFrameworks(env, frameworks):
         if name in supported_frameworks:
             SConscript(env.GetFrameworkScript(name), exports="env")
         else:
-            sys.stderr.write("Error: This board doesn't support %s framework!\n" % f)
+            sys.stderr.write("Error: This board doesn't support %s framework!\n" % name)
             env.Exit(1)