diff --git a/dumb/src/it/readamf.c b/dumb/src/it/readamf.c
index 83f6075e7..820709e9d 100644
--- a/dumb/src/it/readamf.c
+++ b/dumb/src/it/readamf.c
@@ -320,6 +320,8 @@ static DUMB_IT_SIGDATA *it_amf_load_sigdata(DUMBFILE *f, int * version)
 		free( sigdata );
 		return NULL;
 	}
+    
+    sigdata->n_pchannels = nchannels;
 
 	memset( sigdata->channel_volume, 64, DUMB_IT_N_CHANNELS );