diff --git a/.zshrc b/.zshrc
index 8dfbb9e..34903c6 100644
--- a/.zshrc
+++ b/.zshrc
@@ -269,7 +269,9 @@ urldecode() {
 
 ## Custom completion
 # certo
-eval "$(_CERTO_COMPLETE=source_zsh certo)"
+if which certo > /dev/null; then
+  eval "$(_CERTO_COMPLETE=source_zsh certo)"
+fi
 
 ## powerline