diff --git a/src/komodo_nSPV.h b/src/komodo_nSPV.h
index 67ef28246..ee400e3c8 100644
--- a/src/komodo_nSPV.h
+++ b/src/komodo_nSPV.h
@@ -461,7 +461,7 @@ int32_t NSPV_getntzsresp(struct NSPV_ntzsresp *ptr,int32_t height)
     return(sizeof(*ptr));
 }
 
-uint8_t *NSPV_getrawtx(uint256 &hashBlock,int16_t *txlenp,uint256 txid)
+uint8_t *NSPV_getrawtx(uint256 &hashBlock,uint16_t *txlenp,uint256 txid)
 {
     CTransaction tx; uint8_t *rawtx = 0;
     *txlenp = 0;