diff --git a/contrib/teamcity/build-configurations.sh b/contrib/teamcity/build-configurations.sh
--- a/contrib/teamcity/build-configurations.sh
+++ b/contrib/teamcity/build-configurations.sh
@@ -88,8 +88,6 @@
     )
     CMAKE_FLAGS="${CMAKE_FLAGS[*]}" "${CI_SCRIPTS_DIR}"/build_cmake.sh
     ninja check
-    # FIXME Remove when abc-p2p-compactblocks works with ubsan.
-    TEST_RUNNER_FLAGS="${TEST_RUNNER_FLAGS} --exclude=abc-p2p-compactblocks"
     ./test/functional/test_runner.py ${TEST_RUNNER_FLAGS}
     ;;
 
diff --git a/test/functional/abc-p2p-compactblocks.py b/test/functional/abc-p2p-compactblocks.py
--- a/test/functional/abc-p2p-compactblocks.py
+++ b/test/functional/abc-p2p-compactblocks.py
@@ -98,6 +98,8 @@
                             '-limitdescendantsize=999999',
                             '-maxmempool=99999',
                             "-excessiveblocksize={}".format(self.excessive_block_size)]]
+        # UBSAN will cause this test to timeout without this.
+        self.rpc_timeout = 180
 
     def add_options(self, parser):
         super().add_options(parser)