diff --git a/meta/lib/oe/sdk.py b/meta/lib/oe/sdk.py
index 11759aba489..9fe0fbb752d 100644
--- a/meta/lib/oe/sdk.py
+++ b/meta/lib/oe/sdk.py
@@ -148,7 +148,8 @@ def get_extra_sdkinfo(sstate_dir):
     extra_info['filesizes'] = {}
     for root, _, files in os.walk(sstate_dir):
         for fn in files:
-            if fn.endswith('.tgz'):
+            # Note that this makes an assumption about the sstate filenames
+            if '.tar.' in fn and not fn.endswith('.siginfo'):
                 fsize = int(math.ceil(float(os.path.getsize(os.path.join(root, fn))) / 1024))
                 task = fn.rsplit(':',1)[1].split('_',1)[1].split(',')[0]
                 origtotal = extra_info['tasksizes'].get(task, 0)