diff --git a/tools/build_api.py b/tools/build_api.py
index 65f96ec2a2..3237ad74e6 100644
--- a/tools/build_api.py
+++ b/tools/build_api.py
@@ -193,7 +193,7 @@ def is_official_target(target_name, version):
         elif version == '5':
             # For version 5, ARM, GCC_ARM, and IAR toolchain support is required
             required_toolchains = [
-                set(['ARM', 'GCC_ARM', 'IAR']),
+                set(['ARM', 'GCC_ARM']),
                 set(['ARMC6'])
             ]
             supported_toolchains = set(target.supported_toolchains)