diff --git a/CMakeLists.txt b/CMakeLists.txt
index 741e41e..975d5a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -51,12 +51,12 @@ if( USE_SYSTEM_TZ_DB )
 	target_compile_definitions( tz PRIVATE -DHAS_REMOTE_API=0 )
 	# cannot set USE_OS_TZDB to 1 on Windows
 	if( NOT WIN32 )
-		target_compile_definitions( tz PRIVATE -DUSE_OS_TZDB=1 )
+		target_compile_definitions( tz PUBLIC -DUSE_OS_TZDB=1 )
 	endif( )
 else( )
 	target_compile_definitions( tz PRIVATE -DUSE_AUTOLOAD=1 )
 	target_compile_definitions( tz PRIVATE -DHAS_REMOTE_API=1 )
-	target_compile_definitions( tz PRIVATE -DUSE_OS_TZDB=0 )
+	target_compile_definitions( tz PUBLIC -DUSE_OS_TZDB=0 )
 	find_package( CURL REQUIRED )
 	include_directories( SYSTEM ${CURL_INCLUDE_DIRS} )
 	set( OPTIONAL_LIBRARIES ${CURL_LIBRARIES} )
@@ -66,7 +66,7 @@ if( USE_TZ_DB_IN_DOT )
 	target_compile_definitions( tz PRIVATE -DINSTALL=. )
 endif( )
 
-if( NOT TZ_CXX_STANDARD ) 
+if( NOT TZ_CXX_STANDARD )
     set( TZ_CXX_STANDARD 17 )
 endif( )