diff --git a/src/cli.coffee b/src/cli.coffee
index e96c04e..da9cc94 100644
--- a/src/cli.coffee
+++ b/src/cli.coffee
@@ -8,7 +8,7 @@ try
 
 	version = getInput "version"
 	release = Release.find if not version or version is "latest" then "*" else version
-	throw Error "No release matching the version constraint." if not release
+	throw Error "No release matching the version constraint." unless release
 
 	optionalTasks = getBooleanInput "optional-tasks"
 	installed = if optionalTasks then "installed with optional tasks" else "installed"