diff --git a/userspace/units/ptimer/nvgpu-ptimer.c b/userspace/units/ptimer/nvgpu-ptimer.c
index 8c839d8a8..ebcba60f7 100644
--- a/userspace/units/ptimer/nvgpu-ptimer.c
+++ b/userspace/units/ptimer/nvgpu-ptimer.c
@@ -284,6 +284,12 @@ int test_ptimer_scaling(struct unit_module *m,
 		ret = UNIT_FAIL;
 	}
 
+	val = scale_ptimer(10, 6);
+	if (val != 17) {
+		unit_err(m, "ptimer scale calculation incorrect\n");
+		ret = UNIT_FAIL;
+	}
+
 	val = ptimer_scalingfactor10x(100);
 	if (val != (PTIMER_REF_FREQ_HZ*10/100)) {
 		unit_err(m, "ptimer scale calculation incorrect\n");