diff --git a/src/main/java/org/spongepowered/asm/mixin/transformer/MixinClassWriter.java b/src/main/java/org/spongepowered/asm/mixin/transformer/MixinClassWriter.java
index b61c0235e..7f521ec14 100644
--- a/src/main/java/org/spongepowered/asm/mixin/transformer/MixinClassWriter.java
+++ b/src/main/java/org/spongepowered/asm/mixin/transformer/MixinClassWriter.java
@@ -53,10 +53,10 @@ protected String getCommonSuperClass(final String type1, final String type2) {
         ClassInfo d = ClassInfo.forName(type2);
         
         if (c.hasSuperClass(d)) {
-            return type1;
+            return type2;
         }
         if (d.hasSuperClass(c)) {
-            return type2;
+            return type1;
         }
         if (c.isInterface() || d.isInterface()) {
             return MixinClassWriter.JAVA_LANG_OBJECT;
@@ -68,7 +68,7 @@ protected String getCommonSuperClass(final String type1, final String type2) {
                 return MixinClassWriter.JAVA_LANG_OBJECT;
             }
             
-        } while (!c.hasSuperClass(d));
+        } while (!d.hasSuperClass(c));
         
         return c.getName();
     }