diff --git a/Tools/check_code_style.sh b/Tools/check_code_style.sh
index df6afced45..387aab92bf 100755
--- a/Tools/check_code_style.sh
+++ b/Tools/check_code_style.sh
@@ -2,6 +2,7 @@
 set -eu
 failed=0
 for fn in $(find . -path './src/lib/uavcan' -prune -o \
+                   -path './src/lib/mathlib/CMSIS' -prune -o \
                    -path './NuttX' -prune -o \
                    -path './Build' -prune -o \
                    -path './mavlink' -prune -o \