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-rw-r--r--src/libtest/formatters/json.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libtest/formatters/json.rs b/src/libtest/formatters/json.rs
index f7e0788a884..fc5ce5fc291 100644
--- a/src/libtest/formatters/json.rs
+++ b/src/libtest/formatters/json.rs
@@ -50,7 +50,7 @@ impl<T: Write> JsonFormatter<T> {
 impl<T: Write> OutputFormatter for JsonFormatter<T> {
     fn write_run_start(&mut self, test_count: usize) -> io::Result<()> {
         self.write_message(&*format!(
-            r#"{{ "type": "suite", "event": "started", "test_count": "{}" }}"#,
+            r#"{{ "type": "suite", "event": "started", "test_count": {} }}"#,
             test_count
         ))
     }