diff --git a/TESTS/mbed_hal_fpga_ci_test_shield/pwm/main.cpp b/TESTS/mbed_hal_fpga_ci_test_shield/pwm/main.cpp
index 489f68be3f..5220221a10 100644
--- a/TESTS/mbed_hal_fpga_ci_test_shield/pwm/main.cpp
+++ b/TESTS/mbed_hal_fpga_ci_test_shield/pwm/main.cpp
@@ -127,11 +127,11 @@ void fpga_pwm_period_fill_test(PinName pin, uint32_t period_ms, uint32_t fill_pr
             break;
     }
 
-    ThisThread::sleep_for(period_ms);
+    wait_us(PERIOD_US(period_ms));
 
     tester.io_metrics_start();
 
-    ThisThread::sleep_for(NUM_OF_PERIODS * period_ms);
+    wait_us(NUM_OF_PERIODS * PERIOD_US(period_ms));
 
     tester.io_metrics_stop();
     core_util_critical_section_exit();