--- a/pm_test/mm.c	2009-09-16 18:54:04.000000000 +0200
+++ b/pm_test/mm.c	2009-10-30 13:25:25.000000000 +0100
@@ -133,7 +133,7 @@
     PmEvent event;
     int count;
     if (!active) return;
-    while (count = Pm_Read(midi_in, &event, 1)) {
+    while ((count = Pm_Read(midi_in, &event, 1))) {
         if (count == 1) output(event.message);
         else            printf(Pm_GetErrorText(count));
     }