diff --git a/rules.mk b/rules.mk
index 86c8f8cf6..456f9dbbb 100644
--- a/rules.mk
+++ b/rules.mk
@@ -173,6 +173,7 @@ ifneq ($(CONFIG_CCACHE),)
   # FIXME: move this variable to a better location
   export CCACHE_DIR=$(STAGING_DIR)/ccache
   TARGET_CC:= ccache $(TARGET_CC)
+  TARGET_CXX:= ccache $(TARGET_CXX)
 endif
 
 TARGET_CONFIGURE_OPTS = \