diff --git a/test/xi2/protocol-eventconvert.c b/test/xi2/protocol-eventconvert.c
index f723f7436..65ddec507 100644
--- a/test/xi2/protocol-eventconvert.c
+++ b/test/xi2/protocol-eventconvert.c
@@ -247,7 +247,7 @@ static void test_convert_XIRawEvent(void)
         XIClearMask(in.valuators.mask, i);
     }
 
-    for (i = 0; i < sizeof(in.valuators.mask) * 8; i++)
+    for (i = 0; i < MAX_VALUATORS; i++)
     {
         XISetMask(in.valuators.mask, i);