diff --git a/makefile b/makefile
index cd6cfa0..a241672 100644
--- a/makefile
+++ b/makefile
@@ -4,12 +4,15 @@ help:
 	@echo "usage: make [build|install|doc|serve-doc]"
 
 ZIGOPTS ?=
-ZIGOPTIM ?= ReleaseSafe
+ZIGRELEASE ?= small
 
 -include makefile.target
 
 build:
-	zig build -Doptimize=$(ZIGOPTIM) $(ZIGOPTS) $(TARGET_OPTION)
+	zig build --release=$(ZIGRELEASE) $(ZIGOPTS) $(TARGET_OPTION)
+
+clean:
+	-rm -r zig-out/
 
 PREFIX       ?= /usr/local
 LIBDIR       ?= $(PREFIX)/lib