diff --git a/tests/data/test599 b/tests/data/test599
index 269b8c663b..5911b96efc 100644
--- a/tests/data/test599
+++ b/tests/data/test599
@@ -80,7 +80,7 @@ http://%HOSTIP:%HTTPPORT/%TESTNUMBER log/ip%TESTNUMBER
 # Verify data after the test has been "shot"
 <verify>
 <file name="log/ip%TESTNUMBER">
-CL: -1
+CL -1
 </file>
 </verify>
 </testcase>
diff --git a/tests/libtest/lib599.c b/tests/libtest/lib599.c
index 8202919f78..3f2b61c397 100644
--- a/tests/libtest/lib599.c
+++ b/tests/libtest/lib599.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -82,7 +82,7 @@ int test(char *URL)
                             &content_length);
     moo = fopen(libtest_arg2, "wb");
     if(moo) {
-      fprintf(moo, "CL: %.0f\n", content_length);
+      fprintf(moo, "CL %.0f\n", content_length);
       fclose(moo);
     }
   }