diff --git a/unit_tests/unit_test_rules.mk b/unit_tests/unit_test_rules.mk
index 146a164094..3e3989a33c 100644
--- a/unit_tests/unit_test_rules.mk
+++ b/unit_tests/unit_test_rules.mk
@@ -29,7 +29,11 @@ endif
 
 # See explanation in main firmware Makefile for these three defines
 USE_OPT += -DEFI_UNIT_TEST=1 -DEFI_PROD_CODE=0 -DEFI_SIMULATOR=0
-#todo #3221 -fsanitize=address
+
+# Enable address sanitizer, but not on Windows since x86_64-w64-mingw32-g++ doesn't support it.
+ifneq ($(OS),Windows_NT)
+	USE_OPT += -fsanitize=address
+endif
 
 # Pretend we are all different hardware so that all canned engine configs are included
 USE_OPT += -DHW_MICRO_RUSEFI=1 -DHW_PROTEUS=1 -DHW_FRANKENSO=1 -DHW_HELLEN=1
@@ -177,7 +181,10 @@ ULIBDIR =
 # List all user libraries here
 ULIBS = -lm
 ULIBS += --coverage
-#todo #3221 -fsanitize=address
+
+ifneq ($(OS),Windows_NT)
+	ULIBS += -fsanitize=address
+endif
 
 #
 # End of user defines