diff --git a/.drone.star b/.drone.star
index f8b8a038b..37ee00b26 100644
--- a/.drone.star
+++ b/.drone.star
@@ -28,7 +28,7 @@ def main(ctx):
     # Sanitizers:
     #
     result.append(linux_cxx("Ubunti g++-10 C++2a ASAN" + " " + suite, "g++-10", packages="g++-10", privileged=True, buildtype="boost", image="cppalliance/droneubuntu2004:1", environment={'TOOLSET': 'gcc', 'COMPILER': 'g++-10', 'CXXSTD': 'gnu++2a', 'TEST_SUITE': suite, 'OPTIONS': '<cxxflags>-fsanitize=address <linkflags>-fsanitize=address <cxxflags>-DBOOST_CI_SANITIZER_BUILD' }, globalenv=globalenv))
-    result.append(linux_cxx("Ubunti g++-10 C++2a USAN" + " " + suite, "g++-10", packages="g++-10", privileged=True, buildtype="boost", image="cppalliance/droneubuntu2004:1", environment={'TOOLSET': 'gcc', 'COMPILER': 'g++-10', 'CXXSTD': 'gnu++2a', 'TEST_SUITE': suite, 'OPTIONS': '<cxxflags>-fsanitize=undefined <linkflags>-fsanitize=undefined' }, globalenv=globalenv))
+    result.append(linux_cxx("Ubunti g++-10 C++2a USAN" + " " + suite, "g++-10", packages="g++-10", privileged=True, buildtype="boost", image="cppalliance/droneubuntu2004:1", environment={'TOOLSET': 'gcc', 'COMPILER': 'g++-10', 'CXXSTD': 'gnu++2a', 'TEST_SUITE': suite, 'OPTIONS': '<cxxflags>-fsanitize=undefined <linkflags>-fsanitize=undefined <cxxflags>-DBOOST_CI_SANITIZER_BUILD' }, globalenv=globalenv))
     result.append(linux_cxx("Ubunti g++-10 C++2a TSAN" + " " + suite, "g++-10", packages="g++-10", privileged=True, buildtype="boost", image="cppalliance/droneubuntu2004:1", environment={'TOOLSET': 'gcc', 'COMPILER': 'g++-10', 'CXXSTD': 'gnu++2a', 'TEST_SUITE': suite, 'OPTIONS': '<cxxflags>-fsanitize=thread <linkflags>-fsanitize=thread' }, globalenv=globalenv))
     result.append(linux_cxx("Ubunti clang++-10 C++2a ISAN" + " " + suite, "clang++-10", packages="clang-10", privileged=True, buildtype="boost", image="cppalliance/droneubuntu2004:1", environment={'TOOLSET': 'clang', 'COMPILER': 'clang++-10', 'CXXSTD': 'gnu++2a', 'TEST_SUITE': suite, 'OPTIONS': '<cxxflags>-fsanitize=integer <linkflags>-fsanitize=integer' }, globalenv=globalenv))