diff --git a/Meter.c b/Meter.c
index 4da98e56..b4795499 100644
--- a/Meter.c
+++ b/Meter.c
@@ -393,7 +393,7 @@ static void LEDMeterMode_draw(Meter* this, int x, int y, int w) {
    int xx = x + strlen(this->caption);
    int len = RichString_sizeVal(out);
    for (int i = 0; i < len; i++) {
-      char c = RichString_getCharVal(out, i);
+      int c = RichString_getCharVal(out, i);
       if (c >= '0' && c <= '9') {
          LEDMeterMode_drawDigit(xx, y, c - 48);
          xx += 4;