diff --git a/src/eth_plugin_handler.h b/src/eth_plugin_handler.h
index acd982d..dab8ea4 100644
--- a/src/eth_plugin_handler.h
+++ b/src/eth_plugin_handler.h
@@ -6,6 +6,8 @@
 #define NO_EXTRA_INFO(ctx, idx) \
     (allzeroes(&(ctx.transactionContext.extraInfo[idx]), sizeof(extraInfo_t)))
 
+#define NO_NFT_METADATA (NO_EXTRA_INFO(tmpCtx, 1))
+
 void eth_plugin_prepare_init(ethPluginInitContract_t *init,
                              const uint8_t *selector,
                              uint32_t dataSize);
diff --git a/src/nft.h b/src/nft.h
index 43ee5d1..6404dc4 100644
--- a/src/nft.h
+++ b/src/nft.h
@@ -1,14 +1,10 @@
-#ifndef _NFT_H_
-#define _NFT_H_
+#pragma once
 
 #include <stdint.h>
 
 #define COLLECTION_NAME_MAX_LEN 70
-#define NO_NFT_METADATA         (NO_EXTRA_INFO(tmpCtx, 1))
 
 typedef struct nftInfo_t {
     uint8_t contractAddress[ADDRESS_LENGTH];  // must be first item
     char collectionName[COLLECTION_NAME_MAX_LEN + 1];
 } nftInfo_t;
-
-#endif  // _NFT_H_