diff --git a/src/xrt/auxiliary/vk/vk_helpers.c b/src/xrt/auxiliary/vk/vk_helpers.c
index cd2144331..3bf022228 100644
--- a/src/xrt/auxiliary/vk/vk_helpers.c
+++ b/src/xrt/auxiliary/vk/vk_helpers.c
@@ -29,6 +29,19 @@
 #include <xrt/xrt_handles.h>
 
 
+/*
+ *
+ * Small internal helpers.
+ *
+ */
+
+#define CHAIN(STRUCT, NEXT)                                                                                            \
+	do {                                                                                                           \
+		(STRUCT).pNext = NEXT;                                                                                 \
+		NEXT = (VkBaseInStructure *)&(STRUCT);                                                                 \
+	} while (false)
+
+
 /*
  *
  * String helper functions.