diff --git a/block/file-posix.c b/block/file-posix.c
index bfd9b21111..48cd096624 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1022,6 +1022,21 @@ static int raw_handle_perm_lock(BlockDriverState *bs,
     return ret;
 }
 
+/* Sets a specific flag */
+static int fcntl_setfl(int fd, int flag)
+{
+    int flags;
+
+    flags = fcntl(fd, F_GETFL);
+    if (flags == -1) {
+        return -errno;
+    }
+    if (fcntl(fd, F_SETFL, flags | flag) == -1) {
+        return -errno;
+    }
+    return 0;
+}
+
 static int raw_reconfigure_getfd(BlockDriverState *bs, int flags,
                                  int *open_flags, uint64_t perm, bool force_dup,
                                  Error **errp)
diff --git a/include/sysemu/os-posix.h b/include/sysemu/os-posix.h
index adbe19d3e4..58de7c994d 100644
--- a/include/sysemu/os-posix.h
+++ b/include/sysemu/os-posix.h
@@ -96,8 +96,6 @@ static inline void qemu_funlockfile(FILE *f)
     funlockfile(f);
 }
 
-int fcntl_setfl(int fd, int flag);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index b8bf7d4070..289efca3fa 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -897,21 +897,6 @@ size_t qemu_get_host_physmem(void)
     return 0;
 }
 
-/* Sets a specific flag */
-int fcntl_setfl(int fd, int flag)
-{
-    int flags;
-
-    flags = fcntl(fd, F_GETFL);
-    if (flags == -1) {
-        return -errno;
-    }
-    if (fcntl(fd, F_SETFL, flags | flag) == -1) {
-        return -errno;
-    }
-    return 0;
-}
-
 int qemu_msync(void *addr, size_t length, int fd)
 {
     size_t align_mask = ~(qemu_real_host_page_size() - 1);