diff --git a/core/embed/lib/terminal.c b/core/embed/lib/terminal.c
index 9a471aebc..954086a30 100644
--- a/core/embed/lib/terminal.c
+++ b/core/embed/lib/terminal.c
@@ -53,7 +53,7 @@ static uint64_t term_glyph_bits(char ch) {
     uint8_t bytes[8];
   } result = {0};
 
-  if (ch > ' ' && ch < 128) {
+  if (ch > 32 && (uint8_t)ch < 128) {
     const uint8_t *b = &Font_Bitmap[(ch - ' ') * 5];
 
     for (int y = 0; y < 7; y++) {