diff --git a/test/behavior/cast.zig b/test/behavior/cast.zig
index acad6b8f41..9af0f35f8d 100644
--- a/test/behavior/cast.zig
+++ b/test/behavior/cast.zig
@@ -1845,6 +1845,7 @@ test "peer type resolution: three-way resolution combines error set and optional
     if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest; // TODO
 
     const E = error{Foo};
     var a: E = error.Foo;