diff --git a/libs/libc/include/sys/mman.h b/libs/libc/include/sys/mman.h
index 054e9c48..e2b86308 100644
--- a/libs/libc/include/sys/mman.h
+++ b/libs/libc/include/sys/mman.h
@@ -10,6 +10,7 @@
 #define PROT_NONE 0
 #define PROT_READ 1
 #define PROT_WRITE 2
+#define PROT_EXEC 4
 
 #define PAGE_SIZE 4096