diff --git a/src/basic/missing.h b/src/basic/missing.h
index 953b0f413e..9fe750ae28 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -1057,6 +1057,10 @@ struct input_mask {
 #define IPV6_MIN_MTU 1280
 #endif
 
+#ifndef IPV4_MIN_MTU
+#define IPV4_MIN_MTU 68
+#endif
+
 #ifndef IFF_MULTI_QUEUE
 #define IFF_MULTI_QUEUE 0x100
 #endif