diff --git a/rigs/codan/codan.c b/rigs/codan/codan.c
index a8b504bea..13191fbb4 100644
--- a/rigs/codan/codan.c
+++ b/rigs/codan/codan.c
@@ -278,7 +278,7 @@ int codan_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
         return -RIG_EINVAL;
     }
 
-    sprintf((char *) cmd_buf, "mode %s", ttmode);
+    SNPRINTF((char *) cmd_buf, sizeof(cmd_buf), "mode %s", ttmode);
 
     retval = codan_transaction(rig, cmd_buf, 0, &response);
 
@@ -304,7 +304,7 @@ int codan_set_freq(RIG *rig, vfo_t vfo, freq_t freq)
               rig_strvfo(vfo), freq);
 
     // Purportedly can't do split so we just set VFOB=VFOA
-    sprintf(cmd_buf, "connect tcvr rf %.0f %.0f\rfreq", freq, freq);
+    SNPRINTF(cmd_buf, sizeof(cmd_buf), "connect tcvr rf %.0f %.0f\rfreq", freq, freq);
 
     char *response = NULL;
     retval = codan_transaction(rig, cmd_buf, 0, &response);
@@ -397,7 +397,7 @@ int codan_set_ptt(RIG *rig, vfo_t vfo, ptt_t ptt)
 
     rig_debug(RIG_DEBUG_VERBOSE, "%s: ptt=%d\n", __func__, ptt);
 
-    sprintf(cmd_buf, "connect tcvr rf ptt %s\rptt", ptt == 0 ? "off" : "on");
+    SNPRINTF(cmd_buf, sizeof(cmd_buf), "connect tcvr rf ptt %s\rptt", ptt == 0 ? "off" : "on");
     response = NULL;
     retval = codan_transaction(rig, cmd_buf, 0, &response);