diff --git a/srcpkgs/evolution-data-server/template b/srcpkgs/evolution-data-server/template
index 85e71df32e..7b3f4eece0 100644
--- a/srcpkgs/evolution-data-server/template
+++ b/srcpkgs/evolution-data-server/template
@@ -48,6 +48,7 @@ Add_dependency run GConf
 
 Add_dependency build pkg-config
 Add_dependency build intltool
+Add_dependency build flex
 Add_dependency build gperf
 Add_dependency build glib-devel
 Add_dependency build zlib-devel