diff --git a/console-server.h b/console-server.h
index 4360513..7c45f18 100644
--- a/console-server.h
+++ b/console-server.h
@@ -269,7 +269,7 @@
 #endif
 
 #define container_of(ptr, type, member)                                        \
-	((type *)((void *)((ptr) - offsetof(type, member))))
+	((type *)((void *)((char *)(ptr) - offsetof(type, member))))
 
 #define BUILD_ASSERT(c)                                                        \
 	do {                                                                   \