diff --git a/src/cmake/Modules/cpplint.py b/src/cmake/Modules/cpplint.py
index 085c4525c..45236bb42 100755
--- a/src/cmake/Modules/cpplint.py
+++ b/src/cmake/Modules/cpplint.py
@@ -3800,7 +3800,7 @@ def CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error,
 
   # include_state is modified during iteration, so we iterate over a copy of
   # the keys.
-  header_keys = list(include_state):
+  header_keys = list(include_state)
   for header in header_keys:
     (same_module, common_path) = FilesBelongToSameModule(abs_filename, header)
     fullpath = common_path + header