diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ed97b212..b6f707b0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -21,7 +21,7 @@
 #     cmake --build build
 
 cmake_minimum_required(VERSION 3.12)
-project(avrdude VERSION 6.99-20211218)
+project(avrdude VERSION 6.99.20211218)
 
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED True)