diff --git a/srcpkgs/justbuild/template b/srcpkgs/justbuild/template
index cb0a062e2a3..1eb7a9a08c3 100644
--- a/srcpkgs/justbuild/template
+++ b/srcpkgs/justbuild/template
@@ -17,6 +17,9 @@ checksum=850b570ae6da047a5227dca9029225ef7d7d988522924e445e90ae62bf2ca6ae
 conflicts="just>=0"
 nocross="not supported by bootstrapping"
 
+CFLAGS="-Wno-deprecated-declarations"
+CXXFLAGS="-Wno-deprecated-declarations"
+
 do_build() {
 	mkdir -p just-work
 	export JUST_BUILD_CONF=$(jo \
@@ -25,7 +28,9 @@ do_build() {
 		CC=$CC \
 		CXX=$CXX \
 		CFLAGS=$(jo -a -- $CFLAGS) \
+		ADD_CFLAGS=$(jo -a -- $CFLAGS) \
 		CXXFLAGS=$(jo -a -- $CXXFLAGS) \
+		ADD_CXXFLAGS=$(jo -a -- $CXXFLAGS) \
 		LDFLAGS=$(jo -a -- $LDFLAGS) \
 		SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH \
 		VERSION_EXTRA_SUFFIX=-void