diff --git a/src/modules/module-waveout.c b/src/modules/module-waveout.c
index 34607421b..2d9c42eba 100644
--- a/src/modules/module-waveout.c
+++ b/src/modules/module-waveout.c
@@ -469,7 +469,7 @@ int pa__init(pa_core *c, pa_module*m) {
     }
 
     ss = c->default_sample_spec;
-    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map) < 0) {
+    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_WAVEEX) < 0) {
         pa_log(__FILE__": failed to parse sample specification");
         goto fail;
     }