diff --git a/CMakeLists.txt b/CMakeLists.txt
index 46c4e63..357eafc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,8 +91,6 @@ option(
     ON
 )
 if( NOT ${PICOLIBRARY_MICROCHIP_MEGAAVR0_USE_PARENT_PROJECT_AVRLIBCPP} )
-    set( AVRLIBCPP_USE_PARENT_PROJECT_BUILD_FLAGS ON CACHE INTERNAL "" )
-
     set( AVRLIBCPP_SUPPRESS_SFR_MACROS ON CACHE INTERNAL "" )
 
     add_subdirectory( avr-libcpp )
diff --git a/avr-libcpp b/avr-libcpp
index 86c8337..d2ff975 160000
--- a/avr-libcpp
+++ b/avr-libcpp
@@ -1 +1 @@
-Subproject commit 86c83373ed5fa68ab927e4bf1eaf0bccd270bea1
+Subproject commit d2ff975cbaca6fbfc2825a14656831e93316ad3d