diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
index 256c4fb3e..bb7693a37 100644
--- a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
@@ -24,7 +24,6 @@ Silently-ignored flags:
 * `MAP_NONBLOCK`
 * `MAP_NORESERVE`
 * `MAP_POPULATE`
-* `MAP_SYNC`
 
 Partially supported flags:
 * `MAP_FIXED_NOREPLACE` is treated as `MAP_FIXED`
diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/mmap_and_munmap.scml b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/mmap_and_munmap.scml
index 3408d9627..24a9dc867 100644
--- a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/mmap_and_munmap.scml
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/mmap_and_munmap.scml
@@ -11,8 +11,7 @@ opt_flags =
     MAP_LOCKED |
     MAP_NONBLOCK |
     MAP_NORESERVE |
-    MAP_POPULATE |
-    MAP_SYNC;
+    MAP_POPULATE;
 
 // Create a private memory mapping
 mmap(
diff --git a/kernel/src/syscall/mmap.rs b/kernel/src/syscall/mmap.rs
index edc723e4b..04e4ba2f6 100644
--- a/kernel/src/syscall/mmap.rs
+++ b/kernel/src/syscall/mmap.rs
@@ -215,7 +215,6 @@ bitflags! {
         const MAP_NONBLOCK        = 0x10000;
         const MAP_STACK           = 0x20000;
         const MAP_HUGETLB         = 0x40000;
-        const MAP_SYNC            = 0x80000;
         const MAP_FIXED_NOREPLACE = 0x100000;
     }
 }
diff --git a/test/src/apps/mmap/mmap_err.c b/test/src/apps/mmap/mmap_err.c
index 316b1bee3..8cc8e8843 100644
--- a/test/src/apps/mmap/mmap_err.c
+++ b/test/src/apps/mmap/mmap_err.c
@@ -118,6 +118,9 @@ FN_TEST(mmap_flags)
 	TEST_SUCC(munmap(addr, PAGE_SIZE));
 
 	TEST_ERRNO(mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SYNC, fd, 0), EINVAL);
+	TEST_ERRNO(mmap(NULL, PAGE_SIZE, PROT_READ,
+			MAP_SHARED_VALIDATE | MAP_SYNC, fd, 0),
+		   EOPNOTSUPP);
 	TEST_ERRNO(mmap(avail_addr, PAGE_SIZE, PROT_READ,
 			MAP_SHARED_VALIDATE | MAP_FIXED_NOREPLACE, fd, 0),
 		   EOPNOTSUPP);