diff --git a/Source/Checks/cm_cxx_features.cmake b/Source/Checks/cm_cxx_features.cmake
index 02627464..4f6ccdaf 100644
--- a/Source/Checks/cm_cxx_features.cmake
+++ b/Source/Checks/cm_cxx_features.cmake
@@ -44,6 +44,8 @@ function(cm_check_cxx_feature name)
     string(REGEX REPLACE "[^\n]*warning D[0-9][0-9][0-9][0-9][^\n]*" "" check_output "${check_output}")
     # Filter out warnings caused by user flags.
     string(REGEX REPLACE "[^\n]*warning:[^\n]*-Winvalid-command-line-argument[^\n]*" "" check_output "${check_output}")
+    # Filter out clang output warnings
+    string(REGEX REPLACE "[^\n]*warning:[^\n]*-Wunused-command-line-argument[^\n]*" "" check_output "${check_output}")
     # Filter out warnings caused by local configuration.
     string(REGEX REPLACE "[^\n]*warning:[^\n]*directory not found for option[^\n]*" "" check_output "${check_output}")
     string(REGEX REPLACE "[^\n]*warning:[^\n]*object file compiled with -mlong-branch which is no longer needed[^\n]*" "" check_output "${check_output}")