diff --git a/Base/usr/share/man/man2/pledge.md b/Base/usr/share/man/man2/pledge.md
index 2a20f42dc8..51b1524265 100644
--- a/Base/usr/share/man/man2/pledge.md
+++ b/Base/usr/share/man/man2/pledge.md
@@ -54,6 +54,7 @@ If the process later attempts to use any system functionality it has previously
 * `recvfd`: Receive file descriptors over a local socket
 * `ptrace`: The [`ptrace(2)`](ptrace.md) syscall (\*)
 * `prot_exec`: [`mmap(2)`](mmap.md) and [`mprotect(2)`](mprotect.md) with `PROT_EXEC`
+* `map_fixed`: [`mmap(2)`](mmap.md) with `MAP_FIXED` (\*)
 
 Promises marked with an asterisk (\*) are SerenityOS specific extensions not supported by the original OpenBSD `pledge()`.
 
diff --git a/Kernel/Process.h b/Kernel/Process.h
index 01e37ac0f2..f9ee565867 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -82,6 +82,7 @@ void kgettimeofday(timeval&);
     __ENUMERATE_PLEDGE_PROMISE(sigaction) \
     __ENUMERATE_PLEDGE_PROMISE(setkeymap) \
     __ENUMERATE_PLEDGE_PROMISE(prot_exec) \
+    __ENUMERATE_PLEDGE_PROMISE(map_fixed) \
     __ENUMERATE_PLEDGE_PROMISE(getkeymap)
 
 enum class Pledge : u32 {
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index a18dc1d4d5..fa39188769 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -157,6 +157,10 @@ void* Process::sys$mmap(Userspace<const Syscall::SC_mmap_params*> user_params)
         REQUIRE_PROMISE(prot_exec);
     }
 
+    if (prot & MAP_FIXED) {
+        REQUIRE_PROMISE(map_fixed);
+    }
+
     if (alignment & ~PAGE_MASK)
         return (void*)-EINVAL;