diff --git a/GNUmakefile b/GNUmakefile
index 0086c7b..21093a1 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -10,10 +10,10 @@ GO?=	go
 all: dist/ir-bm25 dist/ir-tfidf
 	@true
 
-dist/ir-bm25: cmd/ir-bm25/*
+dist/ir-bm25: cmd/ir-bm25/* internal/**
 	"${GO}" build -o "${DIST}" ./cmd/ir-bm25
 
-dist/ir-tfidf: cmd/ir-tfidf/*
+dist/ir-tfidf: cmd/ir-tfidf/* internal/**
 	"${GO}" build -o "${DIST}" ./cmd/ir-tfidf
 
 clean: