diff --git a/src/main/java/com/android/tools/r8/ir/code/IRCode.java b/src/main/java/com/android/tools/r8/ir/code/IRCode.java
index 9c0a66b..20bba3f 100644
--- a/src/main/java/com/android/tools/r8/ir/code/IRCode.java
+++ b/src/main/java/com/android/tools/r8/ir/code/IRCode.java
@@ -89,7 +89,6 @@
 
   @Override
   public String toString() {
-    ensureBlockNumbering();
     StringBuilder builder = new StringBuilder();
     builder.append("blocks:\n");
     for (BasicBlock block : blocks) {