diff --git a/src/emtests/_common.rs b/src/emtests/_common.rs
index 75604d2d2..78b169f54 100644
--- a/src/emtests/_common.rs
+++ b/src/emtests/_common.rs
@@ -26,7 +26,7 @@ macro_rules! assert_emscripten_output {
             $args,
         )
         .unwrap();
-        let output = capturer.end().0;
+        let output = capturer.end().unwrap().0;
         let expected_output = include_str!($expected);
         assert_eq!(output, expected_output);
     }};