diff --git a/scripts/shared.sh b/scripts/shared.sh
index 9d19e97..78edfe8 100755
--- a/scripts/shared.sh
+++ b/scripts/shared.sh
@@ -113,7 +113,7 @@ function have_command
 # usage: have php && php -v
 function have
 {
-  bkt -- command -v "$1" >&/dev/null
+  bkt -- which -s "$1" >&/dev/null
 }
 
 function brew_installed