diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
index f8c00045..665e1862 100644
--- a/include/uapi/linux/magic.h
+++ b/include/uapi/linux/magic.h
@@ -91,5 +91,6 @@
 #define UDF_SUPER_MAGIC		0x15013346
 #define BALLOON_KVM_MAGIC	0x13661366
 #define ZSMALLOC_MAGIC		0x58295829
+#define DMA_BUF_MAGIC		0x444d4142	/* "DMAB" */
 
 #endif /* __LINUX_MAGIC_H__ */