diff --git a/mongoose.h b/mongoose.h
index 72bb82f6..a0759dad 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -258,6 +258,7 @@ static inline void *mg_calloc(int cnt, size_t size) {
 #define closesocket(x) FreeRTOS_closesocket(x)
 #define gethostbyname(x) FreeRTOS_gethostbyname(x)
 #define getsockname(a, b, c) (-1)
+#define getpeername(a, b, c) 0
 
 // Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
 static inline void *mg_calloc(int cnt, size_t size) {
diff --git a/src/arch_freertos_tcp.h b/src/arch_freertos_tcp.h
index 797f66c7..d4af7006 100644
--- a/src/arch_freertos_tcp.h
+++ b/src/arch_freertos_tcp.h
@@ -46,6 +46,7 @@
 #define closesocket(x) FreeRTOS_closesocket(x)
 #define gethostbyname(x) FreeRTOS_gethostbyname(x)
 #define getsockname(a, b, c) (-1)
+#define getpeername(a, b, c) 0
 
 // Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
 static inline void *mg_calloc(int cnt, size_t size) {