diff --git a/platformio/builder/scripts/frameworks/mbed.py b/platformio/builder/scripts/frameworks/mbed.py
index 2653f2ea..73d5526c 100644
--- a/platformio/builder/scripts/frameworks/mbed.py
+++ b/platformio/builder/scripts/frameworks/mbed.py
@@ -202,7 +202,7 @@ def parse_eix_file(filename):
                 node.get(_nkeys[0]) if len(_nkeys) == 1 else node.attrib)
 
     if "LINKFLAGS" in result:
-        for i, f in enumerate(result["LINKFLAGS"]):
+        for i, flag in enumerate(result["LINKFLAGS"]):
             if f.startswith("-u "):
                 result["LINKFLAGS"][i] = result["LINKFLAGS"][i].split(" ")