diff --git a/lib/bitescript/asm.rb b/lib/bitescript/asm.rb
index 6bbdba0..4965a3d 100644
--- a/lib/bitescript/asm.rb
+++ b/lib/bitescript/asm.rb
@@ -3,16 +3,25 @@
 module BiteScript
   module ASM
     begin
-      # try mangled names for the version included with JRuby
+      # try mangled names for the version included with JRuby <=1.6.0.RC2
       java.lang.Class.for_name 'jruby.objectweb.asm.Opcodes'
       
       # no error, proceed with mangled name
       asm_package = Java::jruby.objectweb.asm
       java_import asm_package.Opcodes
     rescue Exception
-      # fall back on standard names
-      asm_package = org.objectweb.asm
-      java_import asm_package.Opcodes
+      begin
+        # try mangled names for the version included with JRuby >=1.6.0.RC3
+        java.lang.Class.for_name 'org.jruby.org.objectweb.asm.Opcodes'
+        
+        # no error, proceed with mangled name
+        asm_package = Java::org.jruby.org.objectweb.asm
+        java_import asm_package.Opcodes
+      rescue
+        # fall back on standard names
+        asm_package = org.objectweb.asm
+        java_import asm_package.Opcodes
+      end
     end
     java_import asm_package.Label
     java_import asm_package.Type