diff --git a/evolution.spec b/evolution.spec
index 9e8d330..d4f7531 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -115,6 +115,7 @@ BuildRequires: libsoup-devel >= %{soup_version}
 BuildRequires: libtool >= 1.5
 BuildRequires: libxml2-devel
 BuildRequires: pkgconfig
+BuildRequires: unique-devel
 
 %if %{use_mozilla_nss}
 BuildRequires: nspr-devel