diff --git a/vlib/v/pref/pref.v b/vlib/v/pref/pref.v
index 00aa207468..bd26681ec1 100644
--- a/vlib/v/pref/pref.v
+++ b/vlib/v/pref/pref.v
@@ -442,7 +442,7 @@ fn parse_define(mut prefs Preferences, define string) {
 			}
 			else {
 				println('V error: Unknown define argument value `${define_parts[1]}` for ${define_parts[0]}.' +
-					'Expected `0` or `1`.')
+					' Expected `0` or `1`.')
 				exit(1)
 			}
 		}