diff --git a/WHATS_NEW b/WHATS_NEW
index 3d58d83cc..556d6c0e2 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.67 -
 ===============================
+  Don't merge unchanged persistent cache file before dumping if tool scanned.
   Fix incorrect memory pool deallocation while using vg_read for files.
   Add --type parameter description to the lvcreate man page.
   Replace strncmp kernel version number checks with proper ones.
diff --git a/lib/filters/filter-persistent.c b/lib/filters/filter-persistent.c
index 4cb0d7db3..6574d6983 100644
--- a/lib/filters/filter-persistent.c
+++ b/lib/filters/filter-persistent.c
@@ -295,6 +295,7 @@ struct dev_filter *persistent_filter_create(struct dev_filter *real,
 {
 	struct pfilter *pf;
 	struct dev_filter *f = NULL;
+	struct stat info;
 
 	if (!(pf = dm_malloc(sizeof(*pf))))
 		return_NULL;
@@ -314,6 +315,10 @@ struct dev_filter *persistent_filter_create(struct dev_filter *real,
 	if (!(f = dm_malloc(sizeof(*f))))
 		goto_bad;
 
+	/* Only merge cache file before dumping it if it changed externally. */
+	if (!stat(pf->file, &info))
+		pf->ctime = info.st_ctime;
+
 	f->passes_filter = _lookup_p;
 	f->destroy = _persistent_destroy;
 	f->private = pf;