diff --git a/dexlib2/src/main/java/org/jf/dexlib2/analysis/RegisterType.java b/dexlib2/src/main/java/org/jf/dexlib2/analysis/RegisterType.java
index 5ad9d3a7..9fb3b2d1 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/analysis/RegisterType.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/analysis/RegisterType.java
@@ -279,6 +279,15 @@ public class RegisterType {
             assert other.category == UNKNOWN;
             return this;
         }
+
+        if (mergedType != null) {
+            if (mergedType.equals(this.type)) {
+                return this;
+            }
+            if (mergedType.equals(other.type)) {
+                return other;
+            }
+        }
         return RegisterType.getRegisterType(mergedCategory, mergedType);
     }