diff --git a/src/test/test_bitcoin_main.cpp b/src/test/test_bitcoin_main.cpp
--- a/src/test/test_bitcoin_main.cpp
+++ b/src/test/test_bitcoin_main.cpp
@@ -45,8 +45,9 @@
             gArgs.AddArg(arg, "", false, OptionsCategory::HIDDEN);
         }
 
-        if (!gArgs.ParseParameters(utf::master_test_suite().argc,
-                                   utf::master_test_suite().argv, error)) {
+        const auto &master_test_suite = utf::master_test_suite();
+        if (!gArgs.ParseParameters(master_test_suite.argc,
+                                   master_test_suite.argv, error)) {
             throw utf::setup_error(error);
         }
     }
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -35,3 +35,5 @@
 vptr:fs.cpp
 # Only occurs with the cmake build and clang-7
 vptr:avalanche_tests.cpp
+# Only with clang < 9
+vptr:boost/test/tree/observer.hpp