Remove duplicate '--depth=1' git option
diff --git a/Makefile b/Makefile
index b051151..b14cf0b 100644
--- a/Makefile
+++ b/Makefile
@@ -105,7 +105,7 @@
 # Default installs to the user home directory, override by "export PRECHECK_ROOT=<precheck-installation-path>"
 .PHONY: precheck
 precheck:
-	@git clone --depth=1 --branch mpw-5 https://github.com/efabless/mpw_precheck.git --depth=1 $(PRECHECK_ROOT)
+	@git clone --depth=1 --branch mpw-5 https://github.com/efabless/mpw_precheck.git $(PRECHECK_ROOT)
 	@docker pull efabless/mpw_precheck:latest
 
 .PHONY: run-precheck