diff --git a/build-x86_64/tup.config b/build-x86_64/tup.config
index 06a3cf6..4efa6ee 100644
--- a/build-x86_64/tup.config
+++ b/build-x86_64/tup.config
@@ -1,6 +1,7 @@
 CONFIG_TUP_ARCH=x86_64
 
-CONFIG_CC_WRAPPER = ccache
+CONFIG_CC_WRAPPER=ccache
+CONFIG_CXX_WRAPPER=ccache
 
 CONFIG_SCULPT_VERSION=19.02
 CONFIG_SDK_USER=ehmry