diff --git a/Makefile b/Makefile
index 9d6aeec..ad88687 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 BUILD_DIR=dist
 TARGET=$(BUILD_DIR)/unit.js
-SRC=$(wildcard *.js)
+SRC=$(wildcard src/UnitJS/*.js)
 TEMPLATE=unit.js.tpl
 
 all: $(TARGET)