diff --git a/libs/libc/include/sys/mman.h b/libs/libc/include/sys/mman.h
index 3843a85d..e3d858cd 100644
--- a/libs/libc/include/sys/mman.h
+++ b/libs/libc/include/sys/mman.h
@@ -7,6 +7,8 @@ typedef unsigned long off_t;
 
 #define MAP_FAILED (void*)-1
 
+#define PROT_READ_WRITE 1
+
 #ifdef __cplusplus
 extern "C"
 {
diff --git a/libs/libc/src/bits/bindings.c b/libs/libc/src/bits/bindings.c
index 75b85898..a9932bd7 100644
--- a/libs/libc/src/bits/bindings.c
+++ b/libs/libc/src/bits/bindings.c
@@ -13,7 +13,7 @@ int liballoc_unlock()
 
 void* liballoc_alloc(size_t size)
 {
-    void* result = mmap(NULL, size * 4096, 0, 1, 0, 0);
+    void* result = mmap(NULL, size * 4096, PROT_READ_WRITE, 0, 0, 0);
     if (result == MAP_FAILED) return 0;
     return (void*)result;
 }
diff --git a/libs/libc/src/sys/mman.cpp b/libs/libc/src/sys/mman.cpp
index 7b2a747f..c0f68ff0 100644
--- a/libs/libc/src/sys/mman.cpp
+++ b/libs/libc/src/sys/mman.cpp
@@ -5,9 +5,9 @@
 extern "C"
 {
     // FIXME: Implement a POSIX-compliant mmap.
-    void* mmap(void* addr, size_t len, int, int flags, int, off_t)
+    void* mmap(void* addr, size_t len, int prot, int, int, off_t)
     {
-        return (void*)syscall(SYS_mmap, addr, len, flags);
+        return (void*)syscall(SYS_mmap, addr, len, prot);
     }
 
     int munmap(void* addr, size_t len)