diff --git a/source/tanya/container/list.d b/source/tanya/container/list.d
index b271888..81ce4d1 100644
--- a/source/tanya/container/list.d
+++ b/source/tanya/container/list.d
@@ -435,9 +435,9 @@ struct SList(T)
         assert(l2.front == 9);
     }
 
-    version (assert)
+    private bool checkRangeBelonging(ref const Range r) const
     {
-        private bool checkRangeBelonging(ref const Range r) const
+        version (assert)
         {
             const(Entry)* pos = this.head;
             for (; pos !is *r.head && pos !is null; pos = pos.next)
@@ -445,6 +445,10 @@ struct SList(T)
             }
             return pos is *r.head;
         }
+        else
+        {
+            return true;
+        }
     }
 
     /**
@@ -1602,9 +1606,9 @@ struct DList(T)
     /// ditto
     alias insert = insertBack;
 
-    version (assert)
+    private bool checkRangeBelonging(ref const Range r) const
     {
-        private bool checkRangeBelonging(ref const Range r) const
+        version (assert)
         {
             const(Entry)* pos = this.head;
             for (; pos !is *r.head && pos !is null; pos = pos.next)
@@ -1612,6 +1616,10 @@ struct DList(T)
             }
             return pos is *r.head;
         }
+        else
+        {
+            return true;
+        }
     }
 
     /**