diff --git a/src/csv.c b/src/csv.c
index b1d9d92..504142f 100644
--- a/src/csv.c
+++ b/src/csv.c
@@ -112,7 +112,7 @@ void write_to_file(book_t* book)
 	if (0 != file_exists) {
 		file = fopen(FILE_NAME, "w");
 		// write the csv headers to the file since we're making it
-		fprintf(file, "id,isbn,title,authors,imageurl,year of publication,page length\n");
+		fprintf(file, "id,isbn,title,authors,imageurl,year-of-publication,page-length\n");
 		book_id = 1;
 	} else {
 		file = fopen(FILE_NAME, "a");