diff --git a/run_onchange_before_install_main_deps.sh.tmpl b/run_onchange_before_install_main_deps.sh.tmpl
index 1ae87b8..872ce49 100644
--- a/run_onchange_before_install_main_deps.sh.tmpl
+++ b/run_onchange_before_install_main_deps.sh.tmpl
@@ -15,7 +15,9 @@ $Green##########################################################################
 ###############################################################################$NC"
 
 {{ if eq .chezmoi.os "darwin" -}}
-    bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+    if ! type brew;	then
+	  bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+	fi
     brew update
     brew upgrade -y