diff --git a/gegl04.spec b/gegl04.spec
index e6f1a1e..91224b5 100644
--- a/gegl04.spec
+++ b/gegl04.spec
@@ -81,6 +81,7 @@ Summary:        Documentation files for developing with %{name}
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 Obsoletes:      %{name}-devel < 0.4.2
 Conflicts:      %{name}-devel < 0.4.2
+Conflicts:      gegl-devel < 0.4
 
 %description    devel-docs
 The %{name}-devel-docs package contains documentation files for developing
@@ -155,6 +156,7 @@ find %{buildroot} -name '*.la' -delete
 %changelog
 * Mon May 21 2018 Nils Philippsen <nils@tiptoe.de>
 - split off devel docs
+- let gegl04-devel-docs explicitly conflict with old gegl-devel (#1577595)
 
 * Mon May 21 2018 Nils Philippsen <nils@tiptoe.de> - 0.4.2-1
 - version 0.4.2