diff --git a/arch/sparc/include/uapi/asm/socket.h b/arch/sparc/include/uapi/asm/socket.h
index e80ee8641ac3..082578b00cdd 100644
--- a/arch/sparc/include/uapi/asm/socket.h
+++ b/arch/sparc/include/uapi/asm/socket.h
@@ -124,6 +124,9 @@
 
 #define SO_BUF_LOCK              0x0051
 
+#define SO_RESEVE_MEM            0x0052
+
+
 #if !defined(__KERNEL__)