diff --git a/tests/integration/testmanager.nim b/tests/integration/testmanager.nim
index 764a25de..a61d8fba 100644
--- a/tests/integration/testmanager.nim
+++ b/tests/integration/testmanager.nim
@@ -469,7 +469,7 @@ proc captureOutput(
       while (let line = await stream.readLine(0, "\n"); line != ""):
         try:
           output.add line
-          filePath.appendFile(line.stripAnsi)
+          filePath.appendFile(line & "\n".stripAnsi)
           await sleepAsync(1.nanos)
         except IOError as e:
           warn "Failed to write test stdout and/or stderr to file", error = e.msg