diff --git a/CMakeLists.txt b/CMakeLists.txt
index f902b0f..91f016e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,10 +64,12 @@ else( )
 	add_library( tz SHARED ${HEADER_FILES} ${SOURCE_FOLDER}/tz.cpp )
 endif( )
 
-if ( ${CMAKE_MINOR_VERSION} GREATER 7 )
-  set( TZ_CXX_STANDARD 17 )
-else( )
-  set( TZ_CXX_STANDARD 14 )
+if( NOT TZ_CXX_STANDARD ) 
+  if ( ${CMAKE_MINOR_VERSION} GREATER 7 )
+    set( TZ_CXX_STANDARD 17 )
+  else( )
+    set( TZ_CXX_STANDARD 14 )
+  endif( )
 endif( )
 
 set_property(TARGET tz PROPERTY CXX_STANDARD ${TZ_CXX_STANDARD})