diff --git a/slic3r.spec b/slic3r.spec
index 6017393..065abc0 100644
--- a/slic3r.spec
+++ b/slic3r.spec
@@ -5,7 +5,7 @@
 
 Name:           slic3r
 Version:        1.3.0
-Release:        12%{?dist}
+Release:        13%{?dist}
 Summary:        G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)
 License:        AGPLv3 and CC-BY
 # Images are CC-BY, code is AGPLv3
@@ -103,6 +103,10 @@ Requires:       perl(:MODULE_COMPAT_%(eval "`perl -V:version`"; echo $version))
 # It's only used for magically finding octoprint servers.
 #Recommends:    perl(Net::Bonjour)
 
+# Optional dependencies to allow background processing.
+Recommends:     perl(Thread::Queue)
+Recommends:     perl(threads::shared)
+
 %description
 Slic3r is a G-code generator for 3D printers. It's compatible with RepRaps,
 Makerbots, Ultimakers and many more machines.
@@ -237,6 +241,9 @@ SLIC3R_NO_AUTO=1 perl Build.PL installdirs=vendor
 %{_datadir}/%{name}
 
 %changelog
+* Wed May 13 2020 Miro Hrončok <mhroncok@redhat.com> - 1.3.0-13
+- Recommend optional dependencies to have background processing by default
+
 * Mon Mar 16 2020 Jitka Plesnikova <jplesnik@redhat.com> - 1.3.0-12
 - Add BR: perl(Thread::Semaphore)