diff --git a/test/cases/safety/memcpy_alias.zig b/test/cases/safety/memcpy_alias.zig
index 737145746752e240c3e237fbe7879842d9d944c2..f7a1a160246670a9234042b5cfb4d354e6a99864 100644
--- a/test/cases/safety/memcpy_alias.zig
+++ b/test/cases/safety/memcpy_alias.zig
@@ -12,6 +12,7 @@ pub fn main() !void {
     var len: usize = 5;
     _ = &len;
     @memcpy(buffer[0..len], buffer[4 .. 4 + len]);
+    return error.TestFailed;
 }
 // run
 // backend=stage2,llvm
diff --git a/test/cases/safety/memcpy_len_mismatch.zig b/test/cases/safety/memcpy_len_mismatch.zig
index fb6aa2e59b32d83eccb9746c176549b23ef4b959..cfa7f4fa776275abb58c6ef867966528afdfe2e3 100644
--- a/test/cases/safety/memcpy_len_mismatch.zig
+++ b/test/cases/safety/memcpy_len_mismatch.zig
@@ -12,6 +12,7 @@ pub fn main() !void {
     var len: usize = 5;
     _ = &len;
     @memcpy(buffer[0..len], buffer[len .. len + 4]);
+    return error.TestFailed;
 }
 // run
 // backend=stage2,llvm