diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 84b15c9a16..9168a2051c 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -754,20 +754,3 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
     mmap_unlock();
     return new_addr;
 }
-
-int target_msync(abi_ulong start, abi_ulong len, int flags)
-{
-    abi_ulong end;
-
-    if (start & ~TARGET_PAGE_MASK)
-        return -EINVAL;
-    len = TARGET_PAGE_ALIGN(len);
-    end = start + len;
-    if (end < start)
-        return -EINVAL;
-    if (end == start)
-        return 0;
-
-    start &= qemu_host_page_mask;
-    return msync(g2h(start), end - start, flags);
-}
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index 7a1a1ff57a..192a0d2fef 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -425,7 +425,6 @@ int target_munmap(abi_ulong start, abi_ulong len);
 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
                        abi_ulong new_size, unsigned long flags,
                        abi_ulong new_addr);
-int target_msync(abi_ulong start, abi_ulong len, int flags);
 extern unsigned long last_brk;
 extern abi_ulong mmap_next_start;
 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);