diff --git a/builtin/patch-id.c b/builtin/patch-id.c
index 2781598ede..57d9bd4a65 100644
--- a/builtin/patch-id.c
+++ b/builtin/patch-id.c
@@ -173,6 +173,7 @@ static size_t get_one_patchid(struct object_id *next_oid, struct object_id *resu
 		oidclr(next_oid, the_repository->hash_algo);
 
 	flush_one_hunk(result, &ctx);
+	git_hash_discard(&ctx);
 
 	return patchlen;
 }
diff --git a/diff.c b/diff.c
index 397e38b41c..f631bf1e2a 100644
--- a/diff.c
+++ b/diff.c
@@ -6958,6 +6958,7 @@ static int diff_get_patch_id(struct diff_options *options, struct object_id *oid
 		flush_one_hunk(oid, &ctx);
 	}
 
+	git_hash_discard(&ctx);
 	return 0;
 }