diff --git a/setup.sh b/setup.sh
index ac78b73..e37d764 100644
--- a/setup.sh
+++ b/setup.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-[[ $(uname) = "Linux" ]] || echo "alias sshin=\"~/sshin/sshin\"" >> ~/.bashrc; echo "run \"source ~/.bashrc\"";exit
+[[ $(uname) = "Linux" ]] || grep "sshin" ~/.bashrc >/dev/null || echo "alias sshin=\"~/sshin/sshin\"" >> ~/.bashrc; echo "run \"source ~/.bashrc\"";exit
 
 PREFIX=~/.local/ 
 mkdir $PREFIX/share/sshin