diff --git a/libcxx/utils/libcxx/test/config.py b/libcxx/utils/libcxx/test/config.py
--- a/libcxx/utils/libcxx/test/config.py
+++ b/libcxx/utils/libcxx/test/config.py
@@ -490,9 +490,6 @@
                 self.cxx.flags += ['-fsanitize=address']
                 if llvm_symbolizer is not None:
                     self.exec_env['ASAN_SYMBOLIZER_PATH'] = llvm_symbolizer
-                # FIXME: Turn ODR violation back on after PR28391 is resolved
-                # https://llvm.org/PR28391
-                self.exec_env['ASAN_OPTIONS'] = 'detect_odr_violation=0'
                 self.config.available_features.add('asan')
                 self.config.available_features.add('sanitizer-new-delete')
                 self.cxx.compile_flags += ['-O1']