diff --git a/CMakeLists.txt b/CMakeLists.txt
index c485944..5ae22e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.8)
 
 if(DEFINED PROJECT_NAME)
     set(SUBPROJECT ON)
+else()
+    set(SUBPROJECT OFF)
 endif()
 
 project(qtpromise VERSION 0.6.0 LANGUAGES CXX)
@@ -10,6 +12,8 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake")
 
 find_package(Qt5 5.6.0 REQUIRED COMPONENTS Core)
 
+option(qtpromise_BuildTests $<NOT:{SUBPROJECT}>)
+
 include(GNUInstallDirs)
 
 set(CMAKE_AUTOMOC ON)
@@ -125,7 +129,7 @@ install(FILES ${PROJECT_SOURCE_DIR}/include/QtPromise
         DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/qtpromise/include)
 
 
-if(NOT SUBPROJECT)
+if(qtpromise_BuildTests)
     enable_testing()
     add_subdirectory(tests)
 endif()