diff --git a/python-sherpa.changes b/python-sherpa.changes
index ab73065..e0b4213 100644
--- a/python-sherpa.changes
+++ b/python-sherpa.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sat Jan  4 20:12:21 UTC 2020 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Add reproducible.patch to disable optimizing for build CPU
+  to make package build reproducible
+
 -------------------------------------------------------------------
 Tue Jan  8 19:14:59 UTC 2019 - Todd R <toddrme2178@gmail.com>
 
diff --git a/python-sherpa.spec b/python-sherpa.spec
index 7412a13..0ce2f85 100644
--- a/python-sherpa.spec
+++ b/python-sherpa.spec
@@ -27,6 +27,7 @@ URL:            https://github.com/sherpa/sherpa/
 Source:         https://github.com/sherpa/sherpa/archive/%{version}.tar.gz#/sherpa-%{version}.tar.gz
 # PATCH-FIX-UPSTREAM config_with_build.patch -- https://github.com/sherpa/sherpa/pull/714
 Patch0:         config_with_build.patch
+Patch1:         reproducible.patch
 BuildRequires:  %{python_module devel}
 BuildRequires:  %{python_module numpy-devel}
 BuildRequires:  %{python_module setuptools}
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..92cab9c
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,26 @@
+Index: sherpa-4.12.0/extern/fftw-3.3.8/configure
+===================================================================
+--- sherpa-4.12.0.orig/extern/fftw-3.3.8/configure
++++ sherpa-4.12.0/extern/fftw-3.3.8/configure
+@@ -14506,7 +14506,7 @@ main ()
+ }
+ _ACEOF
+ if ac_fn_c_try_compile "$LINENO"; then :
+-  ax_cv_c_flags__mtune_native=yes
++  ax_cv_c_flags__mtune_native=no
+ else
+   ax_cv_c_flags__mtune_native=no
+ fi
+Index: sherpa-4.12.0/extern/fftw-3.3.8/m4/ax_cc_maxopt.m4
+===================================================================
+--- sherpa-4.12.0.orig/extern/fftw-3.3.8/m4/ax_cc_maxopt.m4
++++ sherpa-4.12.0/extern/fftw-3.3.8/m4/ax_cc_maxopt.m4
+@@ -73,7 +73,7 @@ if test "$ac_test_CFLAGS" != "set"; then
+      CFLAGS="-O3 -fomit-frame-pointer"
+ 
+      # tune for the host by default
+-     AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
++     #AX_CHECK_COMPILER_FLAGS(-mtune=native, CFLAGS="$CFLAGS -mtune=native")
+ 
+      # -malign-double for x86 systems
+      AX_CHECK_COMPILER_FLAGS(-malign-double, CFLAGS="$CFLAGS -malign-double")