diff --git a/test/functional/feature_assumevalid.py b/test/functional/feature_assumevalid.py
--- a/test/functional/feature_assumevalid.py
+++ b/test/functional/feature_assumevalid.py
@@ -60,6 +60,8 @@
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 3
+        # Need a bit of extra time when running with the thread sanitizer
+        self.rpc_timeout = 120
 
     def setup_network(self):
         self.add_nodes(3)