diff --git a/test/functional/feature_bip68_sequence.py b/test/functional/feature_bip68_sequence.py
index b6d28afee4..079c9b787d 100755
--- a/test/functional/feature_bip68_sequence.py
+++ b/test/functional/feature_bip68_sequence.py
@@ -38,10 +38,7 @@ class BIP68Test(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
         self.extra_args = [
-            [
-                "-acceptnonstdtxn=1",
-                "-peertimeout=9999",  # bump because mocktime might cause a disconnect otherwise
-            ],
+            ["-acceptnonstdtxn=1"],
             ["-acceptnonstdtxn=0"],
         ]
 
diff --git a/test/functional/feature_maxuploadtarget.py b/test/functional/feature_maxuploadtarget.py
index e4aff0fcbd..eef54463e5 100755
--- a/test/functional/feature_maxuploadtarget.py
+++ b/test/functional/feature_maxuploadtarget.py
@@ -38,7 +38,6 @@ class MaxUploadTest(BitcoinTestFramework):
         self.extra_args = [[
             "-maxuploadtarget=200",
             "-blockmaxsize=999000",
-            "-peertimeout=9999",  # bump because mocktime might cause a disconnect otherwise
             "-maxtipage="+str(2*60*60*24*7),
             "-acceptnonstdtxn=1"
         ]]
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index d435eecf1c..f36450ba8d 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -373,6 +373,11 @@ def write_config(config_path, *, n, chain, extra_config=""):
         f.write("dnsseed=0\n")
         f.write("fixedseeds=0\n")
         f.write("listenonion=0\n")
+        # Increase peertimeout to avoid disconnects while using mocktime.
+        # peertimeout is measured in wall clock time, so setting it to the
+        # duration of the longest test is sufficient. It can be overriden in
+        # tests.
+        f.write("peertimeout=999999\n")
         f.write("printtoconsole=0\n")
         f.write("upnp=0\n")
         f.write("natpmp=0\n")