diff --git a/src/tracker-extract/tracker-extract-oasis.c b/src/tracker-extract/tracker-extract-oasis.c
index 1b28ec2..2019788 100644
--- a/src/tracker-extract/tracker-extract-oasis.c
+++ b/src/tracker-extract/tracker-extract-oasis.c
@@ -172,7 +172,7 @@ void text_handler (GMarkupParseContext *context,
 		case READ_KEYWORDS: {
 				gchar *keywords;
 				if ((keywords = g_hash_table_lookup (metadata, "Doc:Keywords"))) {
-					g_hash_table_replace (metadata, "Doc:Keywords",
+					g_hash_table_replace (metadata, g_strdup ("Doc:Keywords"),
 							g_strconcat (keywords, ",", text, NULL));
 				}
 				else {