diff --git a/include/nng/supplemental/nanolib/parquet.h b/include/nng/supplemental/nanolib/parquet.h
index 6351a3521..f06ebc6f1 100644
--- a/include/nng/supplemental/nanolib/parquet.h
+++ b/include/nng/supplemental/nanolib/parquet.h
@@ -66,7 +66,7 @@ parquet_data_packet *parquet_find_data_packet(conf_parquet *conf, char *filename
 
 parquet_data_packet **parquet_find_data_packets(conf_parquet *conf, char **filenames, uint64_t *keys, uint32_t len);
 
-parquet_data_packet **parquet_find_data_span_packets(conf_parquet *conf, char **filenames, uint32_t len, uint64_t start_key, uint64_t end_key);
+parquet_data_packet **parquet_find_data_span_packets(conf_parquet *conf, uint64_t start_key, uint64_t end_key, uint32_t *size);
 
 #ifdef __cplusplus
 }