diff --git a/src/lwip/silabs/lwipopts-rs911x.h b/src/lwip/silabs/lwipopts-rs911x.h
index c4a7addb27f0fe..72dcd190896c39 100644
--- a/src/lwip/silabs/lwipopts-rs911x.h
+++ b/src/lwip/silabs/lwipopts-rs911x.h
@@ -81,7 +81,7 @@
 #define LWIP_RAW 1
 #define MEMP_NUM_RAW_PCB (4)
 
-#define MEMP_NUM_UDP_PCB (7)
+#define MEMP_NUM_UDP_PCB (6)
 
 #define LWIP_HAVE_LOOPIF (0)
 
@@ -129,7 +129,7 @@
 #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)