diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 4ffe6d14..af536986 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -121,7 +121,7 @@ BB_HASHCONFIG_IGNORE_VARS ?= "${BB_HASHEXCLUDE_COMMON} DATE TIME SSH_AGENT_PID \
     BB_SETSCENE_ENFORCE BB_CMDLINE BB_SERVER_TIMEOUT"
 BB_SIGNATURE_EXCLUDE_FLAGS ?= "doc deps depends \
     lockfiles vardepsexclude vardeps vardepvalue vardepvalueexclude \
-    file-checksums python task nostamp \
+    file-checksums python task nostamp export func \
     sstate-lockfile-shared prefuncs postfuncs export_func deptask rdeptask \
     recrdeptask nodeprrecs stamp-extra-info sstate-outputdirs filename lineno \
     progress mcdepends number_threads"