diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 59dc315c..bb3ab448 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -188,6 +188,9 @@ else()
       add_test(NAME extra_dupfixed_multiple COMMAND test_extra_dupfixed_multiple)
       add_test(NAME extra_hex_base64_base58 COMMAND test_extra_hex_base64_base58)
       add_test(NAME extra_doubtless_positioning COMMAND test_extra_doubtless_positioning)
+      if (ENABLE_MEMCHECK)
+        set_tests_properties(extra_doubtless_positioning PROPERTIES TIMEOUT 10800)
+      endif()
     endif()
   endif()