diff --git a/test/gfx/test.sh b/test/gfx/test.sh
index ae0cb2e7..c571fa40 100755
--- a/test/gfx/test.sh
+++ b/test/gfx/test.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
-[[ -e ./rgbgfx_test ]] || make -C ../.. test/gfx/rgbgfx_test Q= || exit
-[[ -e ./randtilegen ]] || make -C ../.. test/gfx/randtilegen Q= || exit
+[[ -e ./rgbgfx_test ]] || make -C ../.. test/gfx/rgbgfx_test Q= ${CXX:+"CXX=$CXX"} || exit
+[[ -e ./randtilegen ]] || make -C ../.. test/gfx/randtilegen Q= ${CXX:+"CXX=$CXX"} || exit
 
 trap 'rm -f "$errtmp"' EXIT
 errtmp="$(mktemp)"