diff --git a/isl.changes b/isl.changes
index ec5fe2d..e564fea 100644
--- a/isl.changes
+++ b/isl.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Jan 25 13:53:25 UTC 2021 - Andreas Schwab <schwab@suse.de>
+
+- Compile with %optflags
+
 -------------------------------------------------------------------
 Tue Dec 29 17:29:04 UTC 2020 - Dirk Müller <dmueller@suse.com>
 
diff --git a/isl.spec b/isl.spec
index 01db485..e2b6a8e 100644
--- a/isl.spec
+++ b/isl.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package isl
 #
-# Copyright (c) 2020 SUSE LLC
+# Copyright (c) 2021 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -56,6 +56,7 @@ bounded by linear constraints.
 %setup -q
 
 %build
+export CFLAGS_FOR_BUILD="%optflags"
 %configure --disable-static
 %make_build