diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1148e8ed7..433412a6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,8 @@ SET(CLIENT_VERSION ${PAHO_VERSION_MAJOR}.${PAHO_VERSION_MINOR}.${PAHO_VERSION_PA
 
 INCLUDE(GNUInstallDirs)
 
-STRING(TIMESTAMP BUILD_TIMESTAMP UTC)
+STRING(TIMESTAMP REAL_BUILD_TIMESTAMP UTC)
+SET(BUILD_TIMESTAMP ${REAL_BUILD_TIMESTAMP} CACHE STRING "")
 MESSAGE(STATUS "Timestamp is ${BUILD_TIMESTAMP}")
 
 IF(WIN32)