diff --git a/Clover/app/src/main/java/org/floens/chan/utils/ImageSaver.java b/Clover/app/src/main/java/org/floens/chan/utils/ImageSaver.java
index 7aa02f6c..dccb1414 100644
--- a/Clover/app/src/main/java/org/floens/chan/utils/ImageSaver.java
+++ b/Clover/app/src/main/java/org/floens/chan/utils/ImageSaver.java
@@ -169,7 +169,7 @@ public class ImageSaver {
     }
 
     private static String filterName(String name) {
-        return name.replaceAll("[^\\w.]", "");
+        return name.replaceAll("[^a-zA-Z0-9.]", "_");
     }
 
     private static File findUnused(File start, boolean isDir) {