diff --git a/compiler-rt/test/builtins/Unit/lit.cfg.py b/compiler-rt/test/builtins/Unit/lit.cfg.py
--- a/compiler-rt/test/builtins/Unit/lit.cfg.py
+++ b/compiler-rt/test/builtins/Unit/lit.cfg.py
@@ -128,3 +128,12 @@
       builtins_source_feature_duplicates)
   )
 config.available_features.update(builtins_source_features)
+
+# Avoid Windows heuristics which try to detect potential installer programs
+# (which may need to run with elevated privileges) and ask if the user wants
+# to run them in that way. This heuristic may match for executables containing
+# the word "update", e.g. `TestCases/asan_update_allocation.cpp`. Set an
+# environment variable indicating that we want to execute them with the current
+# user.
+if config.host_os == 'Windows':
+  config.environment['__COMPAT_LAYER'] = 'RunAsInvoker'