diff --git a/python-blockdiag.spec b/python-blockdiag.spec
index 4fa1f2f..5d8b791 100644
--- a/python-blockdiag.spec
+++ b/python-blockdiag.spec
@@ -56,6 +56,7 @@ This package installs the %{srcname} module for Python 3.
 
 %package -n python-%{srcname}-devel
 Summary:        Development files for python-%{srcname}
+Requires:       python-%{srcname} = %{version}-%{release}
 
 
 %description -n python-%{srcname}-devel
@@ -64,6 +65,7 @@ Development files for python-%{srcname}.
 
 %package -n python3-%{srcname}-devel
 Summary:        Development files for python3-%{srcname}
+Requires:       python3-%{srcname} = %{version}-%{release}
 
 
 %description -n python3-%{srcname}-devel