diff --git a/CMakeLists.txt b/CMakeLists.txt
index f30d8e9..38f02dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,9 @@
 cmake_minimum_required(VERSION 2.6.0)
 project(toxic C)
 
+execute_process(COMMAND git rev-list HEAD --count OUTPUT_VARIABLE COMMIT)
+SET(GCC_COVERAGE_COMPILE_FLAGS '-DTOXICVER="0.1.1_r${COMMIT}"')
+add_definitions(${GCC_COVERAGE_COMPILE_FLAGS})
 set(exe_name toxic)
 
 add_executable(${exe_name}