diff --git a/Makefile b/Makefile
index df928fb..2e6994d 100644
--- a/Makefile
+++ b/Makefile
@@ -19,11 +19,11 @@ liblcl.dll: liblcl-2.2.3.zip
 	touch liblcl.dll
 
 yvbolt: $(SOURCES)
-	GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -trimpath -ldflags '-s -w'
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build -trimpath -ldflags '-s -w'
 	chmod 755 yvbolt
 
 yvbolt.exe: $(SOURCES)
-	GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc-win32 go build -trimpath -ldflags '-s -w -H windowsgui'
+	CGO_CFLAGS='-O2 -Wno-return-local-addr' GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc-win32 go build -trimpath -ldflags '-s -w -H windowsgui'
 	upx --lzma yvbolt.exe
 
 yvbolt.linux64.tar.xz: yvbolt liblcl.so