diff --git a/evolution.spec b/evolution.spec
index 0dcaacc..8de800e 100644
--- a/evolution.spec
+++ b/evolution.spec
@@ -154,6 +154,7 @@ Group: Applications/Productivity
 Summary: Bogofilter plugin for Evolution
 Requires: %{name} = %{version}-%{release}
 Requires: bogofilter
+BuildRequires: bogofilter
 
 %description bogofilter
 This package contains the plugin to filter junk mail using Bogofilter.
@@ -163,6 +164,7 @@ Group: Applications/Productivity
 Summary: SpamAssassin plugin for Evolution
 Requires: %{name} = %{version}-%{release}
 Requires: spamassassin
+BuildRequires: spamassassin
 
 %description spamassassin
 This package contains the plugin to filter junk mail using SpamAssassin.