diff --git a/fmt/printf.ts b/fmt/printf.ts
index 4bd5c9e0e1cc..d3a87c51bc1c 100644
--- a/fmt/printf.ts
+++ b/fmt/printf.ts
@@ -207,7 +207,7 @@ class Printf {
               this.handleWidthOrPrecisionRef(WorP.WIDTH);
               // force . or flag at this point
               break;
-            default:
+            default: {
               const val = parseInt(c);
               // most likely parseInt does something stupid that makes
               // it unusable for this scenario ...
@@ -220,6 +220,7 @@ class Printf {
               flags.width = flags.width == -1 ? 0 : flags.width;
               flags.width *= 10;
               flags.width += val;
+            }
           } // switch c
           break;
         case State.PRECISION: {