diff --git a/MozillaFirefox.changes b/MozillaFirefox.changes
index b2f79ab..61ce728 100644
--- a/MozillaFirefox.changes
+++ b/MozillaFirefox.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Feb 13 06:12:43 UTC 2019 - Martin Liška <mliska@suse.cz>
+
+- Enable LTO only for latest new toolchain (boo#1125038).
+
 -------------------------------------------------------------------
 Mon Feb 11 10:11:45 UTC 2019 - Martin Liška <mliska@suse.cz>
 
diff --git a/MozillaFirefox.spec b/MozillaFirefox.spec
index a37086b..9e3b0d6 100644
--- a/MozillaFirefox.spec
+++ b/MozillaFirefox.spec
@@ -381,8 +381,11 @@ ac_add_options --with-arch=armv7-a
 ac_add_options --disable-webrtc
 %endif
 %ifarch x86_64
+# LTO needs newer toolchain stack only (at least GCC 8.2.1 (r268506)
+%if 0%{?suse_version} > 1500
 ac_add_options --enable-lto
 %endif
+%endif
 EOF
 ./mach build