diff --git a/osdep.h b/osdep.h
index 09ebace..9e8547c 100644
--- a/osdep.h
+++ b/osdep.h
@@ -23,9 +23,14 @@
 #define unlikely(x)   __builtin_expect(!!(x), 0)
 #endif
 
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *) 0)->MEMBER)
+#endif
+#ifndef container_of
 #define container_of(ptr, type, member) ({                      \
-        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
-        (type *)( (char *)__mptr - offsetof(type,member) );})
+        const typeof(((type *) 0)->member) *__mptr = (ptr);     \
+        (type *) ((char *) __mptr - offsetof(type, member));})
+#endif
 
 #ifndef MIN
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))