diff --git a/test/suite/test_backup13.py b/test/suite/test_backup13.py
index 4e53ff02e..4c4033bb6 100644
--- a/test/suite/test_backup13.py
+++ b/test/suite/test_backup13.py
@@ -33,6 +33,8 @@ from wtbackup import backup_base
 from wtdataset import simple_key
 from wtscenario import make_scenarios
 
+import asyncio
+
 # test_backup13.py
 # Test cursor backup with a block-based incremental cursor and force_stop.
 class test_backup13(backup_base):
@@ -55,7 +57,7 @@ class test_backup13(backup_base):
 
     nops = 1000
 
-    def simulate_crash_restart(self, olddir, newdir):
+    async def simulate_crash_restart(self, olddir, newdir):
         ''' Simulate a crash from olddir and restart in newdir. '''
         # with the connection still open, copy files to new directory.
         shutil.rmtree(newdir, ignore_errors=True)
@@ -67,6 +69,7 @@ class test_backup13(backup_base):
                 "WiredTiger.lock" not in fullname and \
                 "Tmplog" not in fullname and \
                 "Preplog" not in fullname:
+                await asyncio.sleep(0.05)
                 shutil.copy(fullname, newdir)
         # close the original connection and open to new directory.
         self.close_conn()
@@ -129,7 +132,7 @@ class test_backup13(backup_base):
             lambda: self.session.open_cursor('backup:', None, config))
 
         # Make sure after a crash we cannot access old backup info.
-        self.simulate_crash_restart(".", "RESTART")
+        asyncio.run(self.simulate_crash_restart(".", "RESTART"))
         self.assertRaises(wiredtiger.WiredTigerError,
             lambda: self.session.open_cursor('backup:', None, config))