diff --git a/src/transport/container-of.h b/src/transport/container-of.h
index 4c6ce1b..d8e6759 100644
--- a/src/transport/container-of.h
+++ b/src/transport/container-of.h
@@ -4,7 +4,7 @@
 
 #ifndef container_of
 #define container_of(ptr, type, member)                                        \
-	(type *)((char *)(ptr)-offsetof(type, member))
+	(type *)((char *)(ptr) - offsetof(type, member))
 #endif
 
 #endif