diff --git a/dexlib2/src/main/java/org/jf/dexlib2/builder/MutableMethodImplementation.java b/dexlib2/src/main/java/org/jf/dexlib2/builder/MutableMethodImplementation.java
index bc1183cc..e2ba8b3f 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/builder/MutableMethodImplementation.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/builder/MutableMethodImplementation.java
@@ -528,7 +528,7 @@ public class MutableMethodImplementation implements MethodImplementation {
                 setInstruction(location, newBuilderInstruction21ih((Instruction21ih)instruction));
                 return;
             case Format21lh:
-                setInstruction(location, newBuilderInstruction10x((Instruction10x)instruction));
+                setInstruction(location, newBuilderInstruction21lh((Instruction21lh)instruction));
                 return;
             case Format21s:
                 setInstruction(location, newBuilderInstruction21s((Instruction21s)instruction));