diff --git a/rigs/icom/icom.c b/rigs/icom/icom.c
index 7de20938a..0ceb2d77f 100644
--- a/rigs/icom/icom.c
+++ b/rigs/icom/icom.c
@@ -1854,7 +1854,7 @@ int filtericom[] = { 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700,
 pbwidth_t icom_get_dsp_flt(RIG *rig, rmode_t mode)
 {
 
-    int retval, res_len, rfstatus;
+    int retval, res_len=0, rfstatus;
     unsigned char resbuf[MAXFRAMELEN];
     value_t rfwidth;
     unsigned char fw_sub_cmd = RIG_MODEL_IC7200 == rig->caps->rig_model ? 0x02 :
@@ -1864,6 +1864,8 @@ pbwidth_t icom_get_dsp_flt(RIG *rig, rmode_t mode)
     rig_debug(RIG_DEBUG_VERBOSE, "%s called, mode=%s\n", __func__,
               rig_strrmode(mode));
 
+    memset(resbuf, 0, sizeof(resbuf));
+
     if (rig_has_get_func(rig, RIG_FUNC_RF)
             && (mode & (RIG_MODE_RTTY | RIG_MODE_RTTYR)))
     {
diff --git a/rigs/icom/icom.h b/rigs/icom/icom.h
index c363f3b85..d99617257 100644
--- a/rigs/icom/icom.h
+++ b/rigs/icom/icom.h
@@ -30,7 +30,7 @@
 #include <sys/time.h>
 #endif
 
-#define BACKEND_VER "20220819"
+#define BACKEND_VER "20220831"
 
 #define ICOM_IS_SECONDARY_VFO(vfo) ((vfo) & (RIG_VFO_B | RIG_VFO_SUB | RIG_VFO_SUB_B | RIG_VFO_MAIN_B))
 #define ICOM_GET_VFO_NUMBER(vfo) (ICOM_IS_SECONDARY_VFO(vfo) ? 0x01 : 0x00)