diff --git a/p2pool.spec b/p2pool.spec
index d555a73..f6a583d 100644
--- a/p2pool.spec
+++ b/p2pool.spec
@@ -40,7 +40,7 @@ gpgv --keyring ./SChernykh-keyring.gpg %{SOURCE1}
 
 # calc hashes
 trusted_hash=$(sed -n '/Name:\sp2pool_source.tar.xz/,/SHA256:\s/p' %{SOURCE1} | tail -c 65 | head -c 64)
-archive_hash=$(sha256sum %{SOURCE0} | head -c 64)
+archive_hash=$(sha256sum %{SOURCE0} | head -c 64 | tr '[:lower:]' '[:upper:]')
 
 # check against correct hash
 if ! [ $trusted_hash = $archive_hash ]; then