diff --git a/poky/meta/lib/oe/sstatesig.py b/poky/meta/lib/oe/sstatesig.py
index 038404e..abcd962 100644
--- a/poky/meta/lib/oe/sstatesig.py
+++ b/poky/meta/lib/oe/sstatesig.py
@@ -491,7 +491,8 @@
     if task == "package":
         include_timestamps = True
         include_root = False
-    extra_content = d.getVar('HASHEQUIV_HASH_VERSION')
+    hash_version = d.getVar('HASHEQUIV_HASH_VERSION')
+    extra_sigdata = d.getVar("HASHEQUIV_EXTRA_SIGDATA")
 
     filemaps = {}
     for m in (d.getVar('SSTATE_HASHEQUIV_FILEMAP') or '').split():
@@ -506,8 +507,11 @@
         basepath = os.path.normpath(path)
 
         update_hash("OEOuthashBasic\n")
-        if extra_content:
-            update_hash(extra_content + "\n")
+        if hash_version:
+            update_hash(hash_version + "\n")
+
+        if extra_sigdata:
+            update_hash(extra_sigdata + "\n")
 
         # It is only currently useful to get equivalent hashes for things that
         # can be restored from sstate. Since the sstate object is named using