diff --git a/src/de/fernflower/main/ClassesProcessor.java b/src/de/fernflower/main/ClassesProcessor.java
index 00b6726..16a73f6 100644
--- a/src/de/fernflower/main/ClassesProcessor.java
+++ b/src/de/fernflower/main/ClassesProcessor.java
@@ -280,7 +280,7 @@ public class ClassesProcessor {
 			
 			int index = cl.qualifiedName.lastIndexOf("/");
 			if(index >= 0) {
-				String packageName = cl.qualifiedName.substring(0, index).replaceAll("/",".");
+        String packageName = cl.qualifiedName.substring(0, index).replace('/', '.');
                 outwriter.write("package ");
                 outwriter.write(packageName);
                 outwriter.write(";");