diff --git a/scripts/measure-rpc-rtt.mjs b/scripts/measure-rpc-rtt.mjs
index a3a8f70143e4..88f1f52d2752 100644
--- a/scripts/measure-rpc-rtt.mjs
+++ b/scripts/measure-rpc-rtt.mjs
@@ -309,6 +309,12 @@ export function signalGatewayProcess(
     if (!result?.error && result?.status === 0) {
       return true;
     }
+    if (signal !== "SIGKILL") {
+      const forceResult = runTaskkill("taskkill", [...args, "/F"], { stdio: "ignore" });
+      if (!forceResult?.error && forceResult?.status === 0) {
+        return true;
+      }
+    }
   }
   try {
     return child.kill(signal);
diff --git a/test/scripts/measure-rpc-rtt.test.ts b/test/scripts/measure-rpc-rtt.test.ts
index 71bb5a0cd16d..56223ee37f63 100644
--- a/test/scripts/measure-rpc-rtt.test.ts
+++ b/test/scripts/measure-rpc-rtt.test.ts
@@ -367,6 +367,36 @@ describe("scripts/measure-rpc-rtt.mjs", () => {
     expect(child.kill).not.toHaveBeenCalled();
   });
 
+  it("force-kills Windows gateway process trees when graceful taskkill fails", () => {
+    const child = Object.assign(new EventEmitter(), {
+      exitCode: null,
+      kill: vi.fn(),
+      pid: 12345,
+      signalCode: null,
+    });
+    const kill = vi.fn(() => true);
+    const runTaskkill = vi
+      .fn()
+      .mockReturnValueOnce({ error: undefined, status: 1 })
+      .mockReturnValueOnce({ error: undefined, status: 0 });
+
+    expect(
+      signalGatewayProcess(child, "SIGTERM", kill, {
+        platform: "win32",
+        runTaskkill,
+      }),
+    ).toBe(true);
+
+    expect(runTaskkill).toHaveBeenNthCalledWith(1, "taskkill", ["/PID", "12345", "/T"], {
+      stdio: "ignore",
+    });
+    expect(runTaskkill).toHaveBeenNthCalledWith(2, "taskkill", ["/PID", "12345", "/T", "/F"], {
+      stdio: "ignore",
+    });
+    expect(kill).not.toHaveBeenCalled();
+    expect(child.kill).not.toHaveBeenCalled();
+  });
+
   it("treats missing gateway process groups as already exited", () => {
     const child = Object.assign(new EventEmitter(), {
       exitCode: null,