diff --git a/tests/AcDream.Core.Tests/Physics/MotionInterpreterTests.cs b/tests/AcDream.Core.Tests/Physics/MotionInterpreterTests.cs
index addc9fa..1b7d05e 100644
--- a/tests/AcDream.Core.Tests/Physics/MotionInterpreterTests.cs
+++ b/tests/AcDream.Core.Tests/Physics/MotionInterpreterTests.cs
@@ -873,4 +873,19 @@ public sealed class MotionInterpreterTests
 
         Assert.Equal(0f, speed, precision: 4);
     }
+
+    [Fact]
+    public void GetMaxSpeed_RunForward_NoWeenie_FallsBackToMyRunRate()
+    {
+        // WeenieObj is null (MakeInterp with no weenie argument); MyRunRate
+        // is set explicitly. GetMaxSpeed must use MyRunRate as the run-rate
+        // source when InqRunRate is unavailable.
+        var interp = MakeInterp();
+        interp.MyRunRate = 1.75f;
+        interp.InterpretedState.ForwardCommand = MotionCommand.RunForward;
+
+        float speed = interp.GetMaxSpeed();
+
+        Assert.Equal(MotionInterpreter.RunAnimSpeed * 1.75f, speed, precision: 4);
+    }
 }