diff --git a/CMakeLists.txt b/CMakeLists.txt
index a010abf5..db592cc9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@
 cmake_minimum_required(VERSION 3.4.1...3.17.2)
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake;${CMAKE_MODULE_PATH}")
 
-project(ixwebsocket LANGUAGES C CXX VERSION 11.4.6)
+project(ixwebsocket LANGUAGES C CXX VERSION 12.0.0)
 
 set (CMAKE_CXX_STANDARD 11)
 set (CXX_STANDARD_REQUIRED ON)
@@ -282,8 +282,8 @@ endif()
 include(GNUInstallDirs)
 
 target_include_directories(ixwebsocket PUBLIC
-  $<BUILD_INTERFACE:${IXWEBSOCKET_INCLUDE_DIRS}/>
-  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/ixwebsocket>
+  $<BUILD_INTERFACE:${IXWEBSOCKET_INCLUDE_DIRS}>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
 set_target_properties(ixwebsocket PROPERTIES PUBLIC_HEADER "${IXWEBSOCKET_HEADERS}")