diff --git a/targets/gcc.yml b/targets/gcc.yml
index 8b62ba0..06bf058 100644
--- a/targets/gcc.yml
+++ b/targets/gcc.yml
@@ -46,5 +46,6 @@ linker:
 
 unsupported: 
   - unity_64bit_support
+  - callingconv
 
 colour: true