diff --git a/stm-firmware/calibration.c b/stm-firmware/calibration.c
index 373aa35..dd769c0 100644
--- a/stm-firmware/calibration.c
+++ b/stm-firmware/calibration.c
@@ -159,7 +159,7 @@ int calibration_sequence_shell_cmd(shellmatta_handle_t shell)
 
 	/* Check noise values */
 	if (dev > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM || dev2 > CALIBRATION_MAX_PEAK_PEAK_NOISE_OHM) {
-		shellmatta_printf(shell, "Calibration failed! Too much noise. Check you're hardware.\r\n");
+		shellmatta_printf(shell, "Calibration failed! Too much noise. Check your hardware.\r\n");
 		return -3;
 	}