diff --git a/src/query.c b/src/query.c
index 113a871..ba3c1a9 100644
--- a/src/query.c
+++ b/src/query.c
@@ -133,7 +133,7 @@ static int query(
 
 	printf("\nextents:\n");
 	const struct ec3_extent_info *extents = ec3_reader_get_extents(reader);
-	for (unsigned int i = 0; i < c_info->c_nr_tags; i++) {
+	for (unsigned int i = 0; i < c_info->c_nr_extents; i++) {
 		char tag_id[32];
 		ec3_identifier_to_string(
 			extents[i].ex_owner,
diff --git a/src/read.c b/src/read.c
index f518757..8a5fff2 100644
--- a/src/read.c
+++ b/src/read.c
@@ -37,7 +37,7 @@ static void decode_header(const struct ec3_header *in, struct ec3_reader *out)
 	out->c_info.c_cluster_table_offset
 		= b_i64_btoh(in->h_cluster_table_offset);
 	out->c_info.c_nr_tags = b_i32_btoh(in->h_tag_count);
-	out->c_info.c_nr_extents = b_i32_btoh(in->h_tag_count);
+	out->c_info.c_nr_extents = b_i32_btoh(in->h_extent_count);
 	out->c_info.c_nr_cluster_groups = b_i32_btoh(in->h_cluster_group_count);
 	out->c_info.c_encryption_function = b_i16_btoh(in->h_encryption);
 	out->c_info.c_compression_function = b_i16_btoh(in->h_compression);