diff --git a/t/pt-ioprofile/pt-ioprofile.t b/t/pt-ioprofile/pt-ioprofile.t
index 3044fb56..fa01fe9f 100644
--- a/t/pt-ioprofile/pt-ioprofile.t
+++ b/t/pt-ioprofile/pt-ioprofile.t
@@ -50,8 +50,8 @@ like(
 # If the system is really slow, it may take a second to process the files
 # and then clean up all the temp stuff. We'll give it a few seconds benefit of the doubt.
 cmp_ok(
-   $t1 - $t0,
-   '<',
+   int($t1 - $t0),
+   '<=',
    6,
    "Runs for --run-time, more or less"
 );