diff --git a/src/main/java/sirius/biz/storage/util/StorageUtils.java b/src/main/java/sirius/biz/storage/util/StorageUtils.java
index 590bad008..ded25682a 100644
--- a/src/main/java/sirius/biz/storage/util/StorageUtils.java
+++ b/src/main/java/sirius/biz/storage/util/StorageUtils.java
@@ -238,7 +238,7 @@ public boolean containsIllegalFileChars(String name) {
         if (Strings.isEmpty(name)) {
             return true;
         }
-        return SANITIZE_ILLEGAL_FILE_CHARS.split(name).length > 1 || SANITIZE_SLASHES.split(name).length > 1;
+        return SANITIZE_ILLEGAL_FILE_CHARS.matcher(name).find() || SANITIZE_SLASHES.matcher(name).find();
     }
 
     /**