diff --git a/sys/compat/linuxkpi/common/include/linux/stddef.h b/sys/compat/linuxkpi/common/include/linux/stddef.h
index 8a10a679ef06..a3bc6b13765e 100644
--- a/sys/compat/linuxkpi/common/include/linux/stddef.h
+++ b/sys/compat/linuxkpi/common/include/linux/stddef.h
@@ -1,9 +1,15 @@
 /* Public domain */
 
 #ifndef _LINUXKPI_LINUX_STDDEF_H_
 #define	_LINUXKPI_LINUX_STDDEF_H_
 
 #include <sys/stddef.h>
 
+#define	struct_group(NAME, ...)						\
+    union {								\
+	struct { __VA_ARGS__ };						\
+	struct { __VA_ARGS__ } NAME;					\
+    }
+
 #endif	/* _LINUXKPI_LINUX_STDDEF_H_ */