diff --git a/sys/compat/linuxkpi/common/include/linux/stddef.h b/sys/compat/linuxkpi/common/include/linux/stddef.h
index a3bc6b13765e..d04a5a4bf516 100644
--- a/sys/compat/linuxkpi/common/include/linux/stddef.h
+++ b/sys/compat/linuxkpi/common/include/linux/stddef.h
@@ -1,15 +1,31 @@
 /* Public domain */
 
 #ifndef _LINUXKPI_LINUX_STDDEF_H_
 #define	_LINUXKPI_LINUX_STDDEF_H_
 
 #include <sys/stddef.h>
 
-#define	struct_group(NAME, ...)						\
+/*
+ * FreeBSD has multiple (vendor) drivers containing copies of this
+ * and including LinuxKPI headers.  Put the #defines behind guards.
+ */
+
+#ifndef __struct_group
+#define	__struct_group(_tag, _name, _attrs, _members...)		\
     union {								\
-	struct { __VA_ARGS__ };						\
-	struct { __VA_ARGS__ } NAME;					\
-    }
+	struct { _members } _attrs;					\
+	struct _tag { _members } _attrs _name;				\
+    } _attrs
+#endif
 
-#endif	/* _LINUXKPI_LINUX_STDDEF_H_ */
+#ifndef	struct_group
+#define	struct_group(_name, _members...)				\
+    __struct_group(/* no tag */, _name, /* no attrs */, _members)
+#endif
 
+#ifndef	struct_group_tagged
+#define	struct_group_tagged(_tag, _name, _members...)			\
+    __struct_group(_tag, _name, /* no attrs */, _members)
+#endif
+
+#endif	/* _LINUXKPI_LINUX_STDDEF_H_ */