diff --git a/lib/Case.vala b/lib/Case.vala
index 464e523..d1866f9 100644
--- a/lib/Case.vala
+++ b/lib/Case.vala
@@ -16,6 +16,7 @@
 */
 
 namespace ChCase {
+
     /**
      * Represents the case of a text.
      */
diff --git a/lib/PatternType/Pattern.vala b/lib/PatternType/Pattern.vala
index 8b4a354..6bab047 100644
--- a/lib/PatternType/Pattern.vala
+++ b/lib/PatternType/Pattern.vala
@@ -41,11 +41,6 @@ namespace ChCase.PatternType {
         public GLib.Array<string> replace_patterns { get; construct; }
 
         protected Pattern (Case result_case) {
-            Object (
-                detect_patterns: new GLib.Array<string> (),
-                replace_patterns: new GLib.Array<string> ()
-            );
-
             switch (result_case) {
                 case Case.SPACE_SEPARATED:
                     to_space_separated ();
@@ -71,6 +66,11 @@ namespace ChCase.PatternType {
             }
         }
 
+        construct {
+            detect_patterns = new GLib.Array<string> ();
+            replace_patterns = new GLib.Array<string> ();
+        }
+
         /**
          * Set regex patterns; one is to detect the source case and another is to detect the result case.
          *