diff --git a/Makefile b/Makefile
index ac11fb3..417a025 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ PACKAGE_DIR ?= $(HOME)/.arduino15
 endif
 
 
-ARDUINO_INSTALLED_ENV=$(shell ls -dt $(PACKAGE_DIR)/packages/keyboardio/hardware/avr/* 2>/dev/null |head -n 1)
+ARDUINO_INSTALLED_ENV=$(shell ls -dt $(PACKAGE_DIR)/packages/keyboardio/hardware/avr 2>/dev/null |head -n 1)
 MANUALLY_INSTALLED_ENV=$(shell ls -dt $(SKETCHBOOK_DIR)/hardware/keyboardio/avr 2>/dev/null |head -n 1)