diff --git a/CMakeLists.txt b/CMakeLists.txt
index aab1a542..dbc9c893 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,7 +33,7 @@ else()
 endif()
 
 # By default, configure in RelWithDebInfo configuration
-if(NOT SDLIMAGE_ROOTPROJECT)
+if(SDLIMAGE_ROOTPROJECT)
     get_property(is_multi_config GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
     if(is_multi_config)
         # The first item in CMAKE_CONFIGURATION_TYPES is the default configuration