diff --git a/src/liblzma/common/info.c b/src/liblzma/common/info.c
index 2a59a029..cbd32d6b 100644
--- a/src/liblzma/common/info.c
+++ b/src/liblzma/common/info.c
@@ -385,6 +385,7 @@ lzma_info_metadata_set(lzma_info *info, lzma_allocator *allocator,
 
 		const lzma_ret ret = lzma_info_index_set(
 				info, allocator, metadata->index, eat_index);
+		metadata->index = NULL;
 		if (ret != LZMA_OK)
 			return ret;