diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h
index 76b504f70c..0f9e4a1d4b 100644
--- a/bsd-user/bsd-mem.h
+++ b/bsd-user/bsd-mem.h
@@ -81,4 +81,11 @@ static inline abi_long do_bsd_munmap(abi_long arg1, abi_long arg2)
     return get_errno(target_munmap(arg1, arg2));
 }
 
+/* mprotect(2) */
+static inline abi_long do_bsd_mprotect(abi_long arg1, abi_long arg2,
+        abi_long arg3)
+{
+    return get_errno(target_mprotect(arg1, arg2, arg3));
+}
+
 #endif /* BSD_USER_BSD_MEM_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index b03837d032..2d8f1a953b 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -807,6 +807,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_bsd_munmap(arg1, arg2);
         break;
 
+    case TARGET_FREEBSD_NR_mprotect: /* mprotect(2) */
+        ret = do_bsd_mprotect(arg1, arg2, arg3);
+        break;
+
 #if defined(__FreeBSD_version) && __FreeBSD_version >= 1300048
     case TARGET_FREEBSD_NR_shm_open2: /* shm_open2(2) */
         ret = do_freebsd_shm_open2(arg1, arg2, arg3, arg4, arg5);