diff --git a/test/run-test b/test/run-test
index 1528f56..9a8b7c0 100755
--- a/test/run-test
+++ b/test/run-test
@@ -39,9 +39,9 @@ assert()
 {
   test "$@" || {
     local -i code=$?
-    echo "assertion failed: $@" >&2
+    echo "assertion failed: \`$@\` in ${BASH_SOURCE[1]}:${BASH_LINENO[0]}"
     return $code
-  }
+  } >&2
 }