diff --git a/user/tests/wiring/no_fixture/delay.cpp b/user/tests/wiring/no_fixture/delay.cpp
index 56ec387bf8..df2b470666 100644
--- a/user/tests/wiring/no_fixture/delay.cpp
+++ b/user/tests/wiring/no_fixture/delay.cpp
@@ -19,8 +19,15 @@ class DelayTest
     }
 };
 
-test(DELAY_01_delay_1_is_within_5_percent)
+test(DELAY_01_delay_1ms_is_within_tolerance)
 {
+    // These errors are mainly due to processing overhead, which is a greater factor on NRF with a slower clock speed
+#if HAL_PLATFORM_NRF52840
+    const uint32_t delay_us_error = 200; // 20%
+#else
+    const uint32_t delay_us_error = 50; // 5%
+#endif
+
     DelayTest dt(10);
     // on RTOS have to stop task scheduling for the delays or we may not
     // be executed often enough
@@ -31,7 +38,8 @@ test(DELAY_01_delay_1_is_within_5_percent)
         uint32_t end = micros();
         scheduler(true);
 
+        // Serial.printlnf("total time:%lu", end-start);
         assertMoreOrEqual(end-start, 1000);
-        assertLessOrEqual(end-start, 1050);
+        assertLessOrEqual(end-start, 1000 + delay_us_error);
     }
 }
\ No newline at end of file