diff --git a/install.zsh b/install.zsh
index 98dbba2..e80ad16 100755
--- a/install.zsh
+++ b/install.zsh
@@ -61,7 +61,7 @@ cp -rf packages $INSTALL_DIR/packages
 cp -f zshrc $INSTALL_DIR/zshrc
 
 # Insert the INSTALL_DIR variable into the installed run control file
-sed -i -e "1 i\\
+sed -i "" -e "1 i\\
 INSTALL_DIR=$INSTALL_DIR\\
 " $INSTALL_DIR/zshrc