diff --git a/rslib/src/media/col.rs b/rslib/src/media/col.rs
index 20b0e7a88..a563bb93e 100644
--- a/rslib/src/media/col.rs
+++ b/rslib/src/media/col.rs
@@ -4,7 +4,7 @@
 /// Basic note reading/updating functionality for the media DB check.
 use crate::err::{AnkiError, Result};
 use crate::text::strip_html_preserving_image_filenames;
-use crate::time::i64_unix_timestamp;
+use crate::time::{i64_unix_millis, i64_unix_secs};
 use crate::types::{ObjID, Timestamp, Usn};
 use rusqlite::{params, Connection, Row, NO_PARAMS};
 use serde_aux::field_attributes::deserialize_number_from_string;
@@ -127,7 +127,7 @@ fn row_to_note(row: &Row) -> Result<Note> {
 }
 
 pub(super) fn set_note(db: &Connection, note: &mut Note, note_type: &NoteType) -> Result<()> {
-    note.mtime_secs = i64_unix_timestamp();
+    note.mtime_secs = i64_unix_secs();
     // hard-coded for now
     note.usn = -1;
     let csum = field_checksum(&note.fields()[0]);
@@ -154,9 +154,6 @@ pub(super) fn set_note(db: &Connection, note: &mut Note, note_type: &NoteType) -
 }
 
 pub(super) fn mark_collection_modified(db: &Connection) -> Result<()> {
-    db.execute(
-        "update col set usn=-1, mod=?",
-        params![i64_unix_timestamp()],
-    )?;
+    db.execute("update col set mod=?", params![i64_unix_millis()])?;
     Ok(())
 }
diff --git a/rslib/src/time.rs b/rslib/src/time.rs
index fcdede0d2..8d9084c45 100644
--- a/rslib/src/time.rs
+++ b/rslib/src/time.rs
@@ -3,9 +3,16 @@
 
 use std::time;
 
-pub(crate) fn i64_unix_timestamp() -> i64 {
+pub(crate) fn i64_unix_secs() -> i64 {
     time::SystemTime::now()
         .duration_since(time::SystemTime::UNIX_EPOCH)
         .unwrap()
         .as_secs() as i64
 }
+
+pub(crate) fn i64_unix_millis() -> i64 {
+    time::SystemTime::now()
+        .duration_since(time::SystemTime::UNIX_EPOCH)
+        .unwrap()
+        .as_millis() as i64
+}