diff --git a/sandbox/jenkins-test b/sandbox/jenkins-test
index 44266613..0b4c4d72 100755
--- a/sandbox/jenkins-test
+++ b/sandbox/jenkins-test
@@ -59,6 +59,12 @@ export PERCONA_TOOLKIT_SANDBOX="$MYSQL_BASE_DIR"
 export PATH="$PATH:/usr/sbin:$MYSQL_BASE_DIR/bin"
 export LANG="en_US.UTF-8"
 
+# ######################################### #
+# Remove conf files that's shouldn't exist. #
+# ######################################### #
+rm ~/.pt-*conf*
+rm ~/.my*
+
 #############################
 # Check and start test env. #
 #############################
diff --git a/t/pt-stalk/pt-stalk.t b/t/pt-stalk/pt-stalk.t
index 4c3ead15..ed905eb0 100644
--- a/t/pt-stalk/pt-stalk.t
+++ b/t/pt-stalk/pt-stalk.t
@@ -149,9 +149,9 @@ like(
 # the samples may not be precisely 1 second apart.
 chomp($output = `cat $dest/*-df | grep -c '^TS'`);
 ok(
-   $output >= 1 && $output <= 2,
+   $output >= 1 && $output <= 3,
    "Collect ran for --run-time"
-);
+) or diag("Run time: $output");
 
 ok(
    PerconaTest::not_running("pt-stalk --iterations 1"),