diff --git a/Makefile b/Makefile
index 6ee7deb..f36388c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CC=clang
-CFLAGS=-Wall -Wextra -Werror -Os -I/usr/local/include
+CFLAGS=-Wall -Wextra -Werror -Os -I/usr/local/include -fblocks
 OBJECTS=refuse.o deque.o
 LIB=librefuse.a
 
diff --git a/refuse.c b/refuse.c
index 154fae5..bcb27a8 100644
--- a/refuse.c
+++ b/refuse.c
@@ -4,6 +4,10 @@
 #include <string.h>
 #include "refuse.h"
 
+#ifndef __unused
+#define __unused __attribute__((unused))
+#endif
+
 static inline refhdr_t* _refuse_header(void* ptr)
 {
     return (refhdr_t*)((char*)ptr - sizeof(refhdr_t));
@@ -87,4 +91,4 @@ void refuse_release(refuse_t* refuse, void* ptr)
 {
     refhdr_t* hdr = _refuse_header(ptr);
     refdeque_push_back(refuse->dec, hdr);
-}
\ No newline at end of file
+}