diff --git a/build/ninja_gen/src/build.rs b/build/ninja_gen/src/build.rs
index df8ec82fb..33aabc8d2 100644
--- a/build/ninja_gen/src/build.rs
+++ b/build/ninja_gen/src/build.rs
@@ -261,9 +261,10 @@ impl BuildStatement<'_> {
             panic!("{} must generate at least one output", action.name());
         }
         stmt.variables.push(("description".into(), group.into()));
-        if action.check_output_timestamps() {
-            stmt.rule_variables.push(("restat".into(), "1".into()));
-        }
+        stmt.rule_variables.push((
+            "restat".into(),
+            (action.check_output_timestamps() as u32).to_string(),
+        ));
         if action.generator() {
             stmt.rule_variables.push(("generator".into(), "1".into()));
         }