diff --git a/toolchain.inc b/toolchain.inc
index 3165586d78..f985e8843a 100644
--- a/toolchain.inc
+++ b/toolchain.inc
@@ -8,7 +8,7 @@ ifeq ($(CCACHE),)
 $(error ccache selected, but not found in PATH)
 endif
 
-export CCACHE_COMPILERCHECK=content
+export CCACHE_COMPILERCHECK=mtime
 export CCACHE_BASEDIR=$(top)
 export CCACHE_STATSLOG=$(obj)/ccache.stats