diff --git a/tests/AcDream.App.Tests/FrameProfilerReportTests.cs b/tests/AcDream.App.Tests/FrameProfilerReportTests.cs
index e451f576..1a087074 100644
--- a/tests/AcDream.App.Tests/FrameProfilerReportTests.cs
+++ b/tests/AcDream.App.Tests/FrameProfilerReportTests.cs
@@ -33,6 +33,7 @@ public class FrameProfilerReportTests
         Assert.Contains("alloc_kb p50=5.0 max=10.0", line);
         Assert.Contains("gc=3/1/0", line);
         Assert.Contains("upd p50=1.0", line);   // stage 0: 200µs·5 = 1.0 ms
+        Assert.DoesNotContain(",0", line.Replace("gc=3/1/0", ""));  // no comma decimals (invariant culture)
     }
 
     [Fact]