diff --git a/Makefile b/Makefile
index d0e6266c..f83b45eb 100644
--- a/Makefile
+++ b/Makefile
@@ -108,6 +108,12 @@ ifndef DOCKER_IMAGE_NAME
 $(error DOCKER_IMAGE_NAME value is not set)
 endif
 
+# OS-specific flags
+TEST_FLAGS := -race
+ifeq ($(OS),Windows_NT)
+	TEST_FLAGS :=
+endif
+
 .PHONY: all build client client-watch docker lint lint-js lint-go test dependencies clean release docker-multi-arch
 all: build
 
@@ -158,7 +164,7 @@ test:
 	@echo Running JS unit-tests
 	npm run test --prefix client
 	@echo Running Go unit-tests
-	go test -race -v -bench=. -coverprofile=coverage.txt -covermode=atomic ./...
+	go test $(TEST_FLAGS) -v -coverprofile=coverage.txt -covermode=atomic ./...
 
 ci: client_with_deps
 	go mod download
diff --git a/dhcpd/nclient4/client.go b/dhcpd/nclient4/client.go
index 02430ae9..144ab11c 100644
--- a/dhcpd/nclient4/client.go
+++ b/dhcpd/nclient4/client.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 // +build go1.12
 
 // Package nclient4 is a small, minimum-functionality client for DHCPv4.
diff --git a/dhcpd/nclient4/ipv4.go b/dhcpd/nclient4/ipv4.go
index 5733eb46..5d961852 100644
--- a/dhcpd/nclient4/ipv4.go
+++ b/dhcpd/nclient4/ipv4.go
@@ -14,6 +14,7 @@
 //
 // This file contains code taken from gVisor.
 
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 // +build go1.12
 
 package nclient4