diff --git a/tools/toolchains/__init__.py b/tools/toolchains/__init__.py
index a22c066c99..9328dc8575 100644
--- a/tools/toolchains/__init__.py
+++ b/tools/toolchains/__init__.py
@@ -48,7 +48,7 @@ CPU_COUNT_MIN = 1
 CPU_COEF = 1
 
 class mbedToolchain:
-    OFFICILLY_SUPPORTED = False
+    OFFICIALLY_SUPPORTED = False
 
     # Verbose logging
     VERBOSE = True