diff --git a/src/libtest/formatters/json.rs b/src/libtest/formatters/json.rs
index f7e0788a884c3..3c803ad82337f 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
         ))
     }
@@ -136,7 +136,7 @@ impl<T: Write> OutputFormatter for JsonFormatter<T> {
              \"allowed_fail\": {}, \
              \"ignored\": {}, \
              \"measured\": {}, \
-             \"filtered_out\": \"{}\" }}",
+             \"filtered_out\": {} }}",
             if state.failed == 0 { "ok" } else { "failed" },
             state.passed,
             state.failed + state.allowed_fail,
diff --git a/src/test/run-make-fulldeps/libtest-json/output.json b/src/test/run-make-fulldeps/libtest-json/output.json
index 235f8cd7c7257..d8169ece89b38 100644
--- a/src/test/run-make-fulldeps/libtest-json/output.json
+++ b/src/test/run-make-fulldeps/libtest-json/output.json
@@ -1,4 +1,4 @@
-{ "type": "suite", "event": "started", "test_count": "4" }
+{ "type": "suite", "event": "started", "test_count": 4 }
 { "type": "test", "event": "started", "name": "a" }
 { "type": "test", "name": "a", "event": "ok" }
 { "type": "test", "event": "started", "name": "b" }
@@ -7,4 +7,4 @@
 { "type": "test", "name": "c", "event": "ok" }
 { "type": "test", "event": "started", "name": "d" }
 { "type": "test", "name": "d", "event": "ignored" }
-{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "allowed_fail": 0, "ignored": 1, "measured": 0, "filtered_out": "0" }
+{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "allowed_fail": 0, "ignored": 1, "measured": 0, "filtered_out": 0 }