diff --git a/stm-firmware/shell.c b/stm-firmware/shell.c
index 51fcef3..3725182 100644
--- a/stm-firmware/shell.c
+++ b/stm-firmware/shell.c
@@ -161,7 +161,7 @@ static shellmatta_retCode_t shell_cmd_pt1000_res(const shellmatta_handle_t   han
 	pt1000_status = adc_pt1000_get_current_resistance(&resistance);
 
 	if (pt1000_status == 2) {
-		strcat(display_status, " UNSTABLE ");
+		strcat(display_status, "UNSTABLE");
 	} else if (pt1000_status) {
 		strcpy(display_status, "ERROR");
 	} else {