diff --git a/scripts/style_check_in_makefile.sh b/scripts/style_check_in_makefile.sh
index 8398fb7d30..109b0c67f0 100755
--- a/scripts/style_check_in_makefile.sh
+++ b/scripts/style_check_in_makefile.sh
@@ -57,6 +57,7 @@ style_check src/lib/parseArgs
 style_check src/lib/cache
 style_check src/lib/alarmMgr
 style_check src/lib/metricsMgr
+style_check src/lib/expressions
 style_check test/unittests
 style_check test/unittests/orionTypes
 style_check test/unittests/jsonParse