diff --git a/src/lwip/efr32/lwipopts-rs911x.h b/src/lwip/efr32/lwipopts-rs911x.h
index 355ab90dd1e462..5f84181387a69f 100644
--- a/src/lwip/efr32/lwipopts-rs911x.h
+++ b/src/lwip/efr32/lwipopts-rs911x.h
@@ -124,7 +124,7 @@
 #define MEMP_SEPARATE_POOLS (1)
 #define LWIP_PBUF_FROM_CUSTOM_POOLS (0)
 #define MEMP_USE_CUSTOM_POOLS (0)
-#define PBUF_POOL_SIZE (32)
+#define PBUF_POOL_SIZE (16)
 #define PBUF_POOL_BUFSIZE (1280) // IPv6 path MTU
 #define PBUF_CUSTOM_POOL_IDX_START (MEMP_PBUF_POOL_SMALL)
 #define PBUF_CUSTOM_POOL_IDX_END (MEMP_PBUF_POOL_LARGE)