diff --git a/rules.mk b/rules.mk
index 0068350ed..ef2394b74 100644
--- a/rules.mk
+++ b/rules.mk
@@ -175,6 +175,7 @@ INSTALL_CONF:=install -m0600
 
 ifneq ($(CONFIG_CCACHE),)
   TARGET_CC:= ccache $(TARGET_CC)
+  TARGET_CXX:= ccache $(TARGET_CXX)
 endif
 
 TARGET_CONFIGURE_OPTS = \