diff --git a/Makefile b/Makefile
index 9b1c23b..6a67ebe 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ build-dynamic:
 build-static:
 	@cd lib/hello && cargo build --release
 	@cp lib/hello/target/release/libhello.a lib/
-	go build main_static.go
+	go build -tags static main_static.go
 
 .PHONY: run-dynamic
 run-dynamic: build-dynamic
diff --git a/main_dynamic.go b/main_dynamic.go
index 00baac4..eee9e13 100644
--- a/main_dynamic.go
+++ b/main_dynamic.go
@@ -1,3 +1,5 @@
+//go:build !static
+
 package main
 
 // NOTE: There should be NO space between the comments and the `import "C"` line.
diff --git a/main_static.go b/main_static.go
index 1803453..4b2295c 100644
--- a/main_static.go
+++ b/main_static.go
@@ -1,3 +1,5 @@
+//go:build static
+
 package main
 
 // NOTE: There should be NO space between the comments and the `import "C"` line.