diff --git a/gdk-pixbuf2.spec b/gdk-pixbuf2.spec
index a0dbdc4..cc78ae1 100644
--- a/gdk-pixbuf2.spec
+++ b/gdk-pixbuf2.spec
@@ -2,7 +2,7 @@
 
 Name:           gdk-pixbuf2
 Version:        2.38.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        An image loading library
 
 License:        LGPLv2+
@@ -82,6 +82,7 @@ the functionality of the installed %{name} package.
        -Ddocs=true \
        -Djasper=true
 
+%global _smp_mflags -j1
 %meson_build
 
 %install
@@ -142,6 +143,9 @@ gdk-pixbuf-query-loaders-%{__isa_bits} --update-cache
 %{_datadir}/installed-tests
 
 %changelog
+* Mon Sep 10 2018 Kalev Lember <klember@redhat.com> - 2.38.0-4
+- Disable parallel make to work around thumbnailer generation issue (#1626835)
+
 * Mon Sep 10 2018 Kalev Lember <klember@redhat.com> - 2.38.0-3
 - Rebuilt to pick up all thumbnailers (#1626835)