diff --git a/akonadi.spec b/akonadi.spec
index 8af6f82..9d45d31 100644
--- a/akonadi.spec
+++ b/akonadi.spec
@@ -23,6 +23,7 @@ BuildRequires: mysql-server
 BuildRequires: libxslt
 BuildRequires: shared-mime-info
 BuildRequires: boost-devel
+BuildRequires: soprano-devel
 
 # when/if akonadi grows support for other backends, consider splitting
 # these similar to how phonon is done currently.