diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1619c9f565..f3fbcb4d0d 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -10,8 +10,8 @@ project(LEAN CXX C)
 set(LEAN_VERSION_MAJOR 4)
 set(LEAN_VERSION_MINOR 0)
 set(LEAN_VERSION_PATCH 0)
-set(LEAN_VERSION_IS_RELEASE 1)  # This number is 1 in the release revision, and 0 otherwise.
-set(LEAN_SPECIAL_VERSION_DESC "m1" CACHE STRING "Additional version description like 'nightly-2018-03-11'")
+set(LEAN_VERSION_IS_RELEASE 0)  # This number is 1 in the release revision, and 0 otherwise.
+set(LEAN_SPECIAL_VERSION_DESC "" CACHE STRING "Additional version description like 'nightly-2018-03-11'")
 set(LEAN_VERSION_STRING "${LEAN_VERSION_MAJOR}.${LEAN_VERSION_MINOR}.${LEAN_VERSION_PATCH}")
 if (LEAN_SPECIAL_VERSION_DESC)
   set(LEAN_VERSION_STRING "${LEAN_VERSION_STRING}-${LEAN_SPECIAL_VERSION_DESC}")