diff --git a/common/cpw/mods/fml/common/asm/transformers/deobf/FMLDeobfuscatingRemapper.java b/common/cpw/mods/fml/common/asm/transformers/deobf/FMLDeobfuscatingRemapper.java
index c69270e03f..356a65f67c 100644
--- a/common/cpw/mods/fml/common/asm/transformers/deobf/FMLDeobfuscatingRemapper.java
+++ b/common/cpw/mods/fml/common/asm/transformers/deobf/FMLDeobfuscatingRemapper.java
@@ -125,6 +125,7 @@ public class FMLDeobfuscatingRemapper extends Remapper {
 
     public boolean isRemappedClass(String className)
     {
+        className = className.replace('.', '/');
         return classNameBiMap.containsKey(className) || mcpNameBiMap.containsKey(className) || (!classNameBiMap.isEmpty() && className.indexOf('/') == -1);
     }