diff --git a/agent/session_endpoint_test.go b/agent/session_endpoint_test.go
index 2b2c69183077..4e80d8ea30bd 100644
--- a/agent/session_endpoint_test.go
+++ b/agent/session_endpoint_test.go
@@ -397,7 +397,11 @@ func TestSessionTTLRenew(t *testing.T) {
 	}
 
 	// Sleep to consume some time before renew
-	time.Sleep(ttl * (structs.SessionTTLMultiplier / 3))
+	sleepFor := ttl * structs.SessionTTLMultiplier / 3
+	if sleepFor <= 0 {
+		t.Fatalf("timing tests need to sleep")
+	}
+	time.Sleep(sleepFor)
 
 	req, _ = http.NewRequest("PUT", "/v1/session/renew/"+id, nil)
 	resp = httptest.NewRecorder()
@@ -405,6 +409,9 @@ func TestSessionTTLRenew(t *testing.T) {
 	if err != nil {
 		t.Fatalf("err: %v", err)
 	}
+	if obj == nil {
+		t.Fatalf("session '%s' expired before renewal", id)
+	}
 	respObj, ok = obj.(structs.Sessions)
 	if !ok {
 		t.Fatalf("should work")