diff --git a/python-autobahn.changes b/python-autobahn.changes
index 79b27bd..5af58c2 100644
--- a/python-autobahn.changes
+++ b/python-autobahn.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Apr  8 08:41:35 UTC 2019 - Tomáš Chvátal <tchvatal@suse.com>
+
+- Rename reproducible.patch to respect-cflags.patch and really make
+  sure we respect all the cflags
+
 -------------------------------------------------------------------
 Mon Apr  8 07:32:05 UTC 2019 - Bernhard Wiedemann <bwiedemann@suse.com>
 
diff --git a/python-autobahn.spec b/python-autobahn.spec
index fd6b1cb..2281aca 100644
--- a/python-autobahn.spec
+++ b/python-autobahn.spec
@@ -25,8 +25,7 @@ License:        MIT
 Group:          Development/Languages/Python
 URL:            https://github.com/crossbario/autobahn-python
 Source:         https://files.pythonhosted.org/packages/source/a/autobahn/autobahn-%{version}.tar.gz
-# PATCH-FIX-OPENSUSE bmwiedemann -- https://bugzilla.opensuse.org/show_bug.cgi?id=1100677
-Patch0:         reproducible.patch
+Patch0:         respect-cflags.patch
 BuildRequires:  %{python_module PyNaCl >= 1.0.1}
 BuildRequires:  %{python_module PyQRCode >= 1.1}
 BuildRequires:  %{python_module Twisted >= 12.1.0}
@@ -93,6 +92,7 @@ asynchronous Remote Procedure Calls and Publish & Subscribe on top of WebSocket.
 
 %build
 export AUTOBAHN_USE_NVX=true
+export CFLAGS="%{optflags}"
 %python_build
 
 %install
@@ -103,6 +103,7 @@ export AUTOBAHN_USE_NVX=true
 %check
 export USE_ASYNCIO=true
 export AUTOBAHN_USE_NVX=true
+export PYTHONDONTWRITEBYTECODE=1
 %pytest_arch %{buildroot}%{$python_sitearch}/autobahn/
 
 %files %{python_files}
diff --git a/reproducible.patch b/respect-cflags.patch
similarity index 97%
rename from reproducible.patch
rename to respect-cflags.patch
index 700ccbe..c0badf9 100644
--- a/reproducible.patch
+++ b/respect-cflags.patch
@@ -18,7 +18,7 @@ Index: autobahn-19.3.3/autobahn/nvx/_utf8validator.py
          c_source,
          libraries=[],
 -        extra_compile_args=['-std=c99', '-Wall', '-Wno-strict-prototypes', '-O3', '-march=native']
-+        extra_compile_args=['-std=c99', '-Wall', '-Wno-strict-prototypes', '-O3']
++        extra_compile_args=['-std=c99', '-Wall', '-Wno-strict-prototypes']
      )