diff --git a/org.apache.ace.log.server.ui/src/org/apache/ace/log/server/ui/LogViewerExtension.java b/org.apache.ace.log.server.ui/src/org/apache/ace/log/server/ui/LogViewerExtension.java
index f68c7fb7d..2159dc8f3 100644
--- a/org.apache.ace.log.server.ui/src/org/apache/ace/log/server/ui/LogViewerExtension.java
+++ b/org.apache.ace.log.server.ui/src/org/apache/ace/log/server/ui/LogViewerExtension.java
@@ -264,6 +264,6 @@ public void textChange(TextChangeEvent event) {
     }
 
     private String normalize(String input) {
-        return input.toLowerCase().replaceAll("_", " ");
+        return input.toLowerCase().replace("_", " ");
     }
 }