diff --git a/tests/test.cpp b/tests/test.cpp
index a8208adb1a..1e59f59806 100644
--- a/tests/test.cpp
+++ b/tests/test.cpp
@@ -209,7 +209,7 @@ public:
         m_watch.Pause();
         wxPrintf(GetResultStr(m_result));
         if (m_timing)
-            wxPrintf("  %6d ms", m_watch.Time());
+            wxPrintf("  %6ld ms", m_watch.Time());
         wxPrintf("\n");
     }