diff --git a/platformio/builder/scripts/frameworks/mbed.py b/platformio/builder/scripts/frameworks/mbed.py
index 64d269af..2653f2ea 100644
--- a/platformio/builder/scripts/frameworks/mbed.py
+++ b/platformio/builder/scripts/frameworks/mbed.py
@@ -201,6 +201,11 @@ def parse_eix_file(filename):
             result[key].append(
                 node.get(_nkeys[0]) if len(_nkeys) == 1 else node.attrib)
 
+    if "LINKFLAGS" in result:
+        for i, f in enumerate(result["LINKFLAGS"]):
+            if f.startswith("-u "):
+                result["LINKFLAGS"][i] = result["LINKFLAGS"][i].split(" ")
+
     return result