diff --git a/zlib.spec b/zlib.spec
index 327915a..0f4e08c 100644
--- a/zlib.spec
+++ b/zlib.spec
@@ -2,7 +2,7 @@
 
 Name:    zlib
 Version: 1.2.11
-Release: 19%{?dist}
+Release: 20%{?dist}
 Summary: The compression and decompression library
 # /contrib/dotzlib/ have Boost license
 License: zlib and Boost
@@ -102,11 +102,19 @@ CFLAGS+=" -O3"
 %ifarch aarch64
 CFLAGS+=" -DARM_NEON -O3"
 %endif
+%ifarch s390 s390x
+CFLAGS+=" -DDFLTCC"
+%endif
+
+export MKFLAGS=""
+%ifarch s390 s390x
+MKFLAGS+="OBJA=dfltcc.o PIC_OBJA=dfltcc.lo"
+%endif
 
 export LDFLAGS="$LDFLAGS -Wl,-z,relro -Wl,-z,now"
 # no-autotools, %%configure is not compatible
 ./configure --libdir=%{_libdir} --includedir=%{_includedir} --prefix=%{_prefix}
-%make_build
+%make_build $MKFLAGS
 
 %if %{with minizip}
 cd contrib/minizip
@@ -167,6 +175,10 @@ find $RPM_BUILD_ROOT -name '*.la' -delete
 
 
 %changelog
+* Tue Oct 29 2019 Ondrej Dubaj <odubaj@redhat.com> - 1.2.11-20
+- Added -DDFLTCC parameter to configure to enable 
+- Z hardware-accelerated deflate for s390x architectures
+
 * Thu Sep 05 2019 Ondrej Dubaj <odubaj@redhat.com> - 1.2.11-19
 - IBM CRC32 optimalization for POWER 8+ architectures re-add
 - fixed firefox crash duer to zlib (#1741266)