diff --git a/src/commonMain/kotlin/ru/landgrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt b/src/commonMain/kotlin/ru/landgrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
index 1577725..6753728 100644
--- a/src/commonMain/kotlin/ru/landgrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
+++ b/src/commonMain/kotlin/ru/landgrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
@@ -129,6 +129,9 @@ public class CloseableReferenceCounter_Debug {
 
 	@JvmName("withRef\$kt")
 	public inline fun <R> withRef(protected: () -> R): R {
+		contract {
+			callsInPlace(protected, InvocationKind.EXACTLY_ONCE)
+		}
 		this.incref()
 		return safeAutoClose1(finally = this::decref, action = protected)
 	}
diff --git a/src/commonMain/kotlin/ru/landrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt b/src/commonMain/kotlin/ru/landrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
index 9168cfc..551b45e 100644
--- a/src/commonMain/kotlin/ru/landrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
+++ b/src/commonMain/kotlin/ru/landrafhomyak/utility/reference_counter/CloseableReferenceCounter_Debug.kt
@@ -95,9 +95,9 @@ public class CloseableReferenceCounter_Debug {
 
 	@JvmName("withRef\$kt")
 	public inline fun <R> withRef(protected: () -> R): R {
-		/*contract {
+		contract {
 			callsInPlace(protected, InvocationKind.EXACTLY_ONCE)
-		}*/
+		}
 		return this._moved.withRef(protected)
 	}