diff --git a/src/DebugUtils/DefinesUtility.cs b/src/DebugUtils/DefinesUtility.cs
index 3d3a6be..cb90cf6 100644
--- a/src/DebugUtils/DefinesUtility.cs
+++ b/src/DebugUtils/DefinesUtility.cs
@@ -1,4 +1,5 @@
-using System;
+#if UNITY_EDITOR
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -49,3 +50,4 @@ namespace DCFApixels.DragonECS.Unity.Internal
         }
     }
 }
+#endif
\ No newline at end of file