1 files changed, 6 insertions, 1 deletions

diff --git a/src/cuchaz/enigma/mapping/ClassEntry.java b/src/cuchaz/enigma/mapping/ClassEntry.java
index fdb7c2c..f87ddc1 100644
--- a/src/cuchaz/enigma/mapping/ClassEntry.java
+++ b/src/cuchaz/enigma/mapping/ClassEntry.java
@@ -25,12 +25,17 @@ public class ClassEntry implements Entry, Serializable
                 {
                         throw new IllegalArgumentException( "Class name cannot be null!" );
                 }
-                if( className.contains( "." ) )
+                if( className.indexOf( '.' ) >= 0 )
                 {
                         throw new IllegalArgumentException( "Class name must be in JVM format. ie, path/to/package/class$inner" );
                 }
                 
                 m_name = className;
+                
+                if( isInnerClass() && getInnerClassName().indexOf( '/' ) >= 0 )
+                {
+                        throw new IllegalArgumentException( "Inner cast must not have a package: " + getInnerClassName() );
+                }
         }
         
         public ClassEntry( ClassEntry other )