diff --git a/src/dce.c b/src/dce.c
index a66d865..288d69b 100644
--- a/src/dce.c
+++ b/src/dce.c
@@ -46,7 +46,7 @@ int dce_set_flow_control(modem_config *cfg, int opts)
       LOG(LOG_ALL, "Setting RTSCTS flow control");
       status |= CRTSCTS;
     }
-    if ((opts && MDM_FC_XON) != 0) {
+    if ((opts & MDM_FC_XON) != 0) {
       status |= (IXON | IXOFF);
       LOG(LOG_ALL, "Setting XON/XOFF flow control");
     }