diff --git a/CMakeLists.txt b/CMakeLists.txt
index b12de2b..5b1d576 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,9 @@ execute_process(
         -G "${CMAKE_GENERATOR}"
         -D "CMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
         -D "CMAKE_C_COMPILER=${CMAKE_C_COMPILER}"
+        -D "CMAKE_C_FLAGS_DEBUG=${CMAKE_C_FLAGS_DEBUG}"
         -D "CMAKE_Swift_COMPILER=${CMAKE_Swift_COMPILER}"
+        -D "CMAKE_Swift_FLAGS_DEBUG=${CMAKE_Swift_FLAGS_DEBUG}"
         -D "CMAKE_EXPORT_COMPILE_COMMANDS=${CMAKE_EXPORT_COMPILE_COMMANDS}"
     COMMAND_ERROR_IS_FATAL ANY)