diff --git a/Makefile b/Makefile
index 1835e7c3..084a61b2 100644
--- a/Makefile
+++ b/Makefile
@@ -72,7 +72,7 @@ gen-device-stm32:
 
 
 # Build the Go compiler.
-build/tgo: *.go
+build/tgo: *.go compiler/*.go ir/*.go
 	@mkdir -p build
 	go build -o build/tgo -i .