diff --git a/builtin/add.c b/builtin/add.c
index e8fb80b36e7386..c3736aadcd6660 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -389,6 +389,10 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 		       PATHSPEC_STRIP_SUBMODULE_SLASH_EXPENSIVE,
 		       prefix, argv);
 
+	enable_fscache(1);
+	/* We do not really re-read the index, but update the up-to-date flags */
+	preload_index(&the_index, &pathspec);
+
 	if (add_new_files) {
 		int baselen;
 
diff --git a/cache.h b/cache.h
index a55564cae0478a..06d31b07a0d058 100644
--- a/cache.h
+++ b/cache.h
@@ -576,6 +576,7 @@ extern int daemonize(void);
 /* Initialize and use the cache information */
 struct lock_file;
 extern int read_index(struct index_state *);
+extern void preload_index(struct index_state *, const struct pathspec *pathspec);
 extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
 extern int do_read_index(struct index_state *istate, const char *path,
 			 int must_exist); /* for testting only! */
diff --git a/preload-index.c b/preload-index.c
index bd02ba03207f25..f649d0c828cb4b 100644
--- a/preload-index.c
+++ b/preload-index.c
@@ -6,8 +6,7 @@
 #include "dir.h"
 
 #ifdef NO_PTHREADS
-static void preload_index(struct index_state *index,
-			  const struct pathspec *pathspec)
+void preload_index(struct index_state *index, const struct pathspec *pathspec)
 {
 	; /* nothing */
 }
@@ -71,8 +70,7 @@ static void *preload_thread(void *_data)
 	return NULL;
 }
 
-static void preload_index(struct index_state *index,
-			  const struct pathspec *pathspec)
+void preload_index(struct index_state *index, const struct pathspec *pathspec)
 {
 	int threads, i, work, offset;
 	struct thread_data data[MAX_PARALLEL];