diff --git a/serd.changes b/serd.changes
index 3af17e7..e3e54be 100644
--- a/serd.changes
+++ b/serd.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Sep 21 06:23:43 UTC 2018 - olaf@aepfle.de
+
+- Use --std=gnu99 to fix comilation of bogus C code
+
 -------------------------------------------------------------------
 Fri Aug 24 13:57:57 UTC 2018 - tchvatal@suse.com
 
diff --git a/serd.spec b/serd.spec
index c2a38e4..c922949 100644
--- a/serd.spec
+++ b/serd.spec
@@ -64,7 +64,7 @@ Development files for libserd.
 for i in `grep -rl "%{_bindir}/env python"`;do sed -i '1s/^#!.*/#!\/usr\/bin\/python3/' ${i} ;done
 
 %build
-export CFLAGS='%{optflags}'
+export CFLAGS='%{optflags} --std=gnu99'
 export CXXFLAGS='%{optflags}'
 ./waf configure \
   --prefix=%{_prefix} \