diff --git a/components/bt/host/nimble/Kconfig.in b/components/bt/host/nimble/Kconfig.in
index 048f432b86..2aa821ba6f 100644
--- a/components/bt/host/nimble/Kconfig.in
+++ b/components/bt/host/nimble/Kconfig.in
@@ -216,6 +216,16 @@ config BT_NIMBLE_HCI_EVT_LO_BUF_COUNT
         low-priority event buffers, then an incoming advertising report will
         get dropped
 
+config BT_NIMBLE_MSYS1_BLOCK_COUNT
+    int "MSYS_1 Block Count"
+    depends on BT_NIMBLE_ENABLED
+    default 12
+    help
+        MSYS is a system level mbuf registry. For prepare write & prepare
+        responses MBUFs are allocated out of msys_1 pool. For NIMBLE_MESH
+        enabled cases, this block count is increased by 8 than user defined
+        count.
+
 config BT_NIMBLE_HS_FLOW_CTRL
     bool "Enable Host Flow control"
     depends on BT_NIMBLE_ENABLED
diff --git a/components/bt/host/nimble/port/include/esp_nimble_cfg.h b/components/bt/host/nimble/port/include/esp_nimble_cfg.h
index 5ae63c3763..bee688be0f 100644
--- a/components/bt/host/nimble/port/include/esp_nimble_cfg.h
+++ b/components/bt/host/nimble/port/include/esp_nimble_cfg.h
@@ -15,9 +15,9 @@
 /*** kernel/os */
 #ifndef MYNEWT_VAL_MSYS_1_BLOCK_COUNT
 #ifdef CONFIG_BT_NIMBLE_MESH
-#define MYNEWT_VAL_MSYS_1_BLOCK_COUNT (20)
+#define MYNEWT_VAL_MSYS_1_BLOCK_COUNT (CONFIG_BT_NIMBLE_MSYS1_BLOCK_COUNT + 8)
 #else
-#define MYNEWT_VAL_MSYS_1_BLOCK_COUNT (12)
+#define MYNEWT_VAL_MSYS_1_BLOCK_COUNT CONFIG_BT_NIMBLE_MSYS1_BLOCK_COUNT
 #endif
 #endif