diff --git a/src/lib/ubjson/ubjr.c b/src/lib/ubjson/ubjr.c
index 4a5ba97c5a5a0a845bc7263bf7c1aa7d5223402d..afa357b2e2d7442a6492367c5b551ac3e1106be2 100644
--- a/src/lib/ubjson/ubjr.c
+++ b/src/lib/ubjson/ubjr.c
@@ -57,6 +57,7 @@ ubjr_context_t* ubjr_open_callback(void* userdata,
 size_t ubjr_close_context(ubjr_context_t* ctx)
 {
 	size_t n = ctx->total_read;
+	free(ctx->userdata);
 	free(ctx);
 	return n;
 }