diff --git a/include/zephyr/bluetooth/audio/bap.h b/include/zephyr/bluetooth/audio/bap.h
index 583644a37e8c8f..c6dbb1798f0e82 100644
--- a/include/zephyr/bluetooth/audio/bap.h
+++ b/include/zephyr/bluetooth/audio/bap.h
@@ -41,6 +41,18 @@
 extern "C" {
 #endif
 
+/**
+ * @brief Check if a BAP BASS BIS_Sync bitfield is valid
+ *
+ * Valid options are eiter a bitmask of valid BIS indices, including none (0x00000000)
+ * or @ref BT_BAP_BIS_SYNC_NO_PREF (0xFFFFFFFF).
+ *
+ * @param _bis_bitfield BIS_Sync bitfield (uint32)
+ */
+#define BT_BAP_BASS_VALID_BIT_BITFIELD(_bis_bitfield)                                              \
+	((_bis_bitfield) == 0U || (_bis_bitfield) == BT_BAP_BIS_SYNC_NO_PREF ||                    \
+	 BT_ISO_VALID_BIS_BITFIELD(_bis_bitfield))
+
 /**
  * @brief Helper to declare elements of bt_bap_qos_cfg
  *
diff --git a/subsys/bluetooth/audio/shell/audio.h b/subsys/bluetooth/audio/shell/audio.h
index 8539725d5948f6..97478158324f0e 100644
--- a/subsys/bluetooth/audio/shell/audio.h
+++ b/subsys/bluetooth/audio/shell/audio.h
@@ -37,9 +37,6 @@
 #define SHELL_PRINT_INDENT_LEVEL_SIZE 2
 #define MAX_CODEC_FRAMES_PER_SDU      4U
 
-/* BIS sync is a 32-bit bitfield where BIT(0) is not allowed */
-#define VALID_BIS_SYNC(_bis_sync) ((bis_sync & BIT(0)) == 0U && bis_sync < UINT32_MAX)
-
 extern struct bt_csip_set_member_svc_inst *svc_inst;
 
 ssize_t audio_ad_data_add(struct bt_data *data, const size_t data_size, const bool discoverable,
diff --git a/subsys/bluetooth/audio/shell/bap_broadcast_assistant.c b/subsys/bluetooth/audio/shell/bap_broadcast_assistant.c
index d47e730d4ef910..d434f1a79450c0 100644
--- a/subsys/bluetooth/audio/shell/bap_broadcast_assistant.c
+++ b/subsys/bluetooth/audio/shell/bap_broadcast_assistant.c
@@ -439,7 +439,7 @@ static int cmd_bap_broadcast_assistant_add_src(const struct shell *sh,
 			return -ENOEXEC;
 		}
 
-		if (!VALID_BIS_SYNC(bis_sync)) {
+		if (!BT_BAP_BASS_VALID_BIT_BITFIELD(bis_sync)) {
 			shell_error(sh, "Invalid bis_sync: %lu", bis_sync);
 
 			return -ENOEXEC;
@@ -667,7 +667,7 @@ static int cmd_bap_broadcast_assistant_add_broadcast_id(const struct shell *sh,
 			shell_error(sh, "failed to parse bis_sync: %d", err);
 
 			return -ENOEXEC;
-		} else if (!VALID_BIS_SYNC(bis_sync)) {
+		} else if (!BT_BAP_BASS_VALID_BIT_BITFIELD(bis_sync)) {
 			shell_error(sh, "Invalid bis_sync: %lu", bis_sync);
 
 			return -ENOEXEC;
@@ -735,7 +735,7 @@ static int cmd_bap_broadcast_assistant_add_broadcast_name(const struct shell *sh
 			shell_error(sh, "failed to parse bis_sync: %d", err);
 
 			return -ENOEXEC;
-		} else if (!VALID_BIS_SYNC(bis_sync)) {
+		} else if (!BT_BAP_BASS_VALID_BIT_BITFIELD(bis_sync)) {
 			shell_error(sh, "Invalid bis_sync: %lu", bis_sync);
 
 			return -ENOEXEC;
@@ -836,7 +836,7 @@ static int cmd_bap_broadcast_assistant_mod_src(const struct shell *sh,
 			return -ENOEXEC;
 		}
 
-		if (!VALID_BIS_SYNC(bis_sync)) {
+		if (!BT_BAP_BASS_VALID_BIT_BITFIELD(bis_sync)) {
 			shell_error(sh, "Invalid bis_sync: %lu", bis_sync);
 
 			return -ENOEXEC;
diff --git a/subsys/bluetooth/audio/shell/cap_commander.c b/subsys/bluetooth/audio/shell/cap_commander.c
index 4531c68426e957..579039b34938c2 100644
--- a/subsys/bluetooth/audio/shell/cap_commander.c
+++ b/subsys/bluetooth/audio/shell/cap_commander.c
@@ -605,7 +605,7 @@ static int cmd_cap_commander_broadcast_reception_start(const struct shell *sh, s
 			return -ENOEXEC;
 		}
 
-		if (!VALID_BIS_SYNC(bis_sync)) {
+		if (!BT_BAP_BASS_VALID_BIT_BITFIELD(bis_sync)) {
 			shell_error(sh, "Invalid bis_sync: %lu", bis_sync);
 
 			return -ENOEXEC;