diff --git a/extensions/scarb-doc/src/main.rs b/extensions/scarb-doc/src/main.rs
index 7cf7dbafb..8dde04637 100644
--- a/extensions/scarb-doc/src/main.rs
+++ b/extensions/scarb-doc/src/main.rs
@@ -65,7 +65,8 @@ fn main_inner() -> Result<()> {
         OutputFormat::Json => {
             let versioned_json_output = VersionedJsonOutput::new(package_information_map);
             let output = serde_json::to_string_pretty(&versioned_json_output)
-                .expect("failed to serialize information about crates");
+                .expect("failed to serialize information about crates")
+                + "\n";
             let output_path = output_dir.join("output.json");
 
             fs::write(output_path, output)
diff --git a/extensions/scarb-doc/tests/data/json_output_test_data.json b/extensions/scarb-doc/tests/data/json_output_test_data.json
index 5d1c4e451..c0f58e917 100644
--- a/extensions/scarb-doc/tests/data/json_output_test_data.json
+++ b/extensions/scarb-doc/tests/data/json_output_test_data.json
@@ -278,4 +278,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}