diff --git a/Makefile b/Makefile
index 4ac218e935e8804b02bcfdebcc94cad72f17fd6c..95031ef56e155d7b0166dec760949cc4098a3d32 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ pip = python -m $(PIP)
 poetry = python -m $(POETRY)
 venv = . $(VENV)/bin/activate &&
 
-PACKAGES = greg/ gregsite/
+PACKAGES = greg/ gregsite/ gregui/
 
 all: test