diff --git a/src/baguette-crystal-base.cr b/src/baguette-crystal-base.cr
index ceb4146..f115fc6 100644
--- a/src/baguette-crystal-base.cr
+++ b/src/baguette-crystal-base.cr
@@ -12,7 +12,7 @@ class Baguette::Configuration
 		# Check for provided file first,
 		# then $XDG_CONFIG_HOME/<class>.yml,
 		# then /etc/baguette/<class>.yml.
-		def self.get(file : String?)
+		def self.get(file : String? = nil)
 			filename = "/" + (self.name.downcase.gsub /baguette::configuration::/, "") + ".yml"
 			directory = "/baguette"