diff --git a/mip/driver_stm32.c b/mip/driver_stm32.c
index 691705ba..0379fd77 100644
--- a/mip/driver_stm32.c
+++ b/mip/driver_stm32.c
@@ -3,7 +3,7 @@
 
 #include "mip.h"
 
-#if MG_ENABLE_MIP
+#if MG_ENABLE_MIP && defined(__arm__)
 
 struct stm32_eth {
   uint32_t MACCR, MACFFR, MACHTHR, MACHTLR, MACMIIAR, MACMIIDR, MACFCR,
diff --git a/mongoose.c b/mongoose.c
index 3166d908..3dbfb1a0 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -5630,7 +5630,7 @@ size_t mg_ws_wrap(struct mg_connection *c, size_t len, int op) {
 
 
 
-#if MG_ENABLE_MIP
+#if MG_ENABLE_MIP && defined(__arm__)
 
 struct stm32_eth {
   uint32_t MACCR, MACFFR, MACHTHR, MACHTLR, MACMIIAR, MACMIIDR, MACFCR,