diff --git a/.drone.star b/.drone.star
index 37ee00b26..7f3b36ccc 100644
--- a/.drone.star
+++ b/.drone.star
@@ -16,7 +16,7 @@ windowsglobalimage="cppalliance/dronevs2019"
 def main(ctx):
 
   things_to_test = [ "special_fun", "distribution_tests", "mp", "misc", "interpolators", "quadrature", "autodiff", "long-running-tests", "float128_tests" ]
-  sanitizer_test = [ "special_fun", "distribution_tests", "mp", "misc", "interpolators", "quadrature", "autodiff", "float128_tests" ]
+  sanitizer_test = [ "special_fun", "distribution_tests", "misc", "interpolators", "quadrature", "autodiff", "float128_tests" ]
   gnu_6_stds = [ "gnu++11", "gnu++14" ]
   gnu_8_stds = [ "gnu++11", "gnu++14", "gnu++17" ]
   gnu_10_stds = [ "gnu++11", "gnu++14", "gnu++17", "gnu++20" ]
diff --git a/config/is_ci_sanitizer_run.cpp b/config/is_ci_sanitizer_run.cpp
index 2d7d07336..68eedfe67 100644
--- a/config/is_ci_sanitizer_run.cpp
+++ b/config/is_ci_sanitizer_run.cpp
@@ -3,8 +3,8 @@
 //  Boost Software License, Version 1.0. (See accompanying file
 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
-#if defined(BOOST_CI_SANITIZER_BUILD)
-# error "Sanitizer is in effect".
+#if !defined(BOOST_CI_SANITIZER_BUILD)
+# error "Sanitizer is NOT in effect".
 #endif
 
 int main()