diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index 349ba9d..87c23a7 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Sep 25 07:03:29 UTC 2019 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Allow to build without profile guided optimizations (boo#1040589)
+
 -------------------------------------------------------------------
 Fri Sep 20 09:21:05 UTC 2019 - Martin Liška <mliska@suse.cz>
 
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index 39a4b86..1b2efcb 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -454,10 +454,13 @@ ac_add_options --enable-optimize="-O1"
 %ifarch x86_64
 # LTO needs newer toolchain stack only (at least GCC 8.2.1 (r268506)
 %if 0%{?suse_version} > 1500
+%if 0%{?do_profiling}
 ac_add_options --enable-lto
+# for some reason, building with LTO fails without PGO
 ac_add_options MOZ_PGO=1
 %endif
 %endif
+%endif
 EOF
 %if !%{with only_print_mozconfig}
 %ifarch ppc64 s390x s390