diff --git a/utils/check-style/check-style b/utils/check-style/check-style
index a3f0612510d..f3df2dc9543 100755
--- a/utils/check-style/check-style
+++ b/utils/check-style/check-style
@@ -312,3 +312,5 @@ then
     echo "ErrorCodes.cpp contains non-unique error codes"
 fi
 
+# Forbid files that differ only by character case
+find $ROOT_PATH | sort -f | uniq -i -c | awk '{ if ($1 > 1) print }'