diff --git a/spice-qemu-char.c b/spice-qemu-char.c
index 0f8903e1f73fd84e197770cb4e5f4be9902e41aa..d41bb745a82d437eb1d12d50d7edaa62841bd30a 100644
--- a/spice-qemu-char.c
+++ b/spice-qemu-char.c
@@ -172,7 +172,7 @@ static GSource *spice_chr_add_watch(CharDriverState *chr, GIOCondition cond)
     SpiceCharDriver *scd = chr->opaque;
     SpiceCharSource *src;
 
-    assert(cond == G_IO_OUT);
+    assert(cond & G_IO_OUT);
 
     src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
                                           sizeof(SpiceCharSource));