diff --git a/tools/hako_shared/json_parser.hako b/tools/hako_shared/json_parser.hako
index ddf2b582..4a75bac6 100644
--- a/tools/hako_shared/json_parser.hako
+++ b/tools/hako_shared/json_parser.hako
@@ -116,21 +116,20 @@ static box JsonParserBox {
       }
     }
 
-    // Digits (workaround: flatten to avoid MIR nested-if-in-loop bug)
-    local parsing_done = 0
+    // Digits (fixed: use flat control flow instead of nested-if-in-loop)
+    local digits = "0123456789"
     loop(p < s.length()) {
-      if parsing_done == 1 { break }
-
       local ch = s.substring(p, p+1)
-      local digits = "0123456789"
       local digit_pos = digits.indexOf(ch)
 
-      if digit_pos >= 0 {
-        num_str = num_str + ch
-        p = p + 1
-      } else {
-        parsing_done = 1
+      // Exit condition: non-digit character found
+      if digit_pos < 0 {
+        break
       }
+
+      // Continue parsing: digit found
+      num_str = num_str + ch
+      p = p + 1
     }
 
     if num_str == "" || num_str == "-" { return null }