diff --git a/td/telegram/StickerFormat.cpp b/td/telegram/StickerFormat.cpp
index 314e8c361..25e0503e5 100644
--- a/td/telegram/StickerFormat.cpp
+++ b/td/telegram/StickerFormat.cpp
@@ -73,7 +73,7 @@ bool is_sticker_format_vector(StickerFormat sticker_format) {
   }
 }
 
-size_t get_max_sticker_file_size(StickerFormat sticker_format, bool for_thumbnail) {
+int64 get_max_sticker_file_size(StickerFormat sticker_format, bool for_thumbnail) {
   switch (sticker_format) {
     case StickerFormat::Unknown:
     case StickerFormat::Webp:
diff --git a/td/telegram/StickerFormat.h b/td/telegram/StickerFormat.h
index dfa9a55f7..23560f12d 100644
--- a/td/telegram/StickerFormat.h
+++ b/td/telegram/StickerFormat.h
@@ -25,7 +25,7 @@ bool is_sticker_format_animated(StickerFormat sticker_format);
 
 bool is_sticker_format_vector(StickerFormat sticker_format);
 
-size_t get_max_sticker_file_size(StickerFormat sticker_format, bool for_thumbnail);
+int64 get_max_sticker_file_size(StickerFormat sticker_format, bool for_thumbnail);
 
 StringBuilder &operator<<(StringBuilder &string_builder, StickerFormat sticker_format);