diff --git a/Telegram/SourceFiles/data/data_birthday.cpp b/Telegram/SourceFiles/data/data_birthday.cpp
index 679933fb1a..65707664f2 100644
--- a/Telegram/SourceFiles/data/data_birthday.cpp
+++ b/Telegram/SourceFiles/data/data_birthday.cpp
@@ -41,8 +41,6 @@ namespace {
 
 } // namespace
 
-Birthday::Birthday() = default;
-
 Birthday::Birthday(int day, int month, int year)
 : _value(Validate(day, month, year) ? Serialize(day, month, year) : 0) {
 }
diff --git a/Telegram/SourceFiles/data/data_birthday.h b/Telegram/SourceFiles/data/data_birthday.h
index 064ff6cf0b..ebf4060c89 100644
--- a/Telegram/SourceFiles/data/data_birthday.h
+++ b/Telegram/SourceFiles/data/data_birthday.h
@@ -11,7 +11,7 @@ namespace Data {
 
 class Birthday final {
 public:
-	Birthday();
+	constexpr Birthday() = default;
 	Birthday(int day, int month, int year = 0);
 
 	[[nodiscard]] static Birthday FromSerialized(int value);