diff --git a/src/translations/tts_cz.cpp b/src/translations/tts_cz.cpp
index b816414e7..e297d4523 100644
--- a/src/translations/tts_cz.cpp
+++ b/src/translations/tts_cz.cpp
@@ -136,6 +136,11 @@ PLAY_FUNCTION(playNumber, int16_t number, uint8_t unit, uint8_t att)
       prompts.append(Prompt(GUIDE_00_MILLION, dir=2))
 */
 
+  if (number < 0) {
+    PUSH_PROMPT(PROMPT_MINUS);
+    number = -number;
+  }
+
   int8_t mode = MODE(att);
   if (mode > 0) {
     div_t qr = div(number, (mode == 1 ? 10 : 100));