diff --git a/applications/services/gui/modules/text_input.c b/applications/services/gui/modules/text_input.c
index d98128c6d..ebe32b7a5 100644
--- a/applications/services/gui/modules/text_input.c
+++ b/applications/services/gui/modules/text_input.c
@@ -138,7 +138,7 @@ static bool char_is_lowercase(char letter) {
 static char char_to_uppercase(const char letter) {
     if(letter == '_') {
         return 0x20;
-    } else if(isalpha(letter)) {
+    } else if(char_is_lowercase(letter)) {
         return (letter - 0x20);
     } else {
         return letter;