1diff --git a/tools/install.sh b/tools/install.sh
2index 1a0a8e6db468b0683599a92fa3a511cb5221e4c9..ad47df7858b2574e07137f4db5375e876a60dc02 100755
3--- a/tools/install.sh
4+++ b/tools/install.sh
5@@ -24,7 +24,7 @@ main() {
6 # which may fail on systems lacking tput or terminfo
7 set -e
8 9- if command -v zsh >/dev/null 2>&1; then
10+ if ! command -v zsh >/dev/null 2>&1; then
11 printf "${YELLOW}Zsh is not installed!${NORMAL} Please install zsh first!\n"
12 exit
13 fi