diff --git a/RenderCore/Base/CKNonNull.h b/RenderCore/Base/CKNonNull.h
index 2663a2bd4..c2f2dafed 100644
--- a/RenderCore/Base/CKNonNull.h
+++ b/RenderCore/Base/CKNonNull.h
@@ -15,6 +15,7 @@
 #if CK_NOT_SWIFT
 
 #import <RenderCore/RCAssert.h>
+#import <utility>
 
 namespace CK {