diff --git a/qd.spec b/qd.spec
index 03573e1..da5b45f 100644
--- a/qd.spec
+++ b/qd.spec
@@ -3,7 +3,7 @@
 
 Name:		qd
 Version:	2.3.15
-Release:	4%{?dist}
+Release:	5%{?dist}
 Summary:	Double-Double and Quad-Double Arithmetic
 Group:		Applications/Engineering
 License:	BSD
@@ -53,6 +53,9 @@ are also included.
 %setup -q -n qd-%{version}
 
 %build
+%ifarch s390 s390x aarch64
+%global optflags %{optflags} -ffp-contract=off
+%endif
 export CC=gcc
 export CXX=g++	
 export FC=gfortran
@@ -81,11 +84,7 @@ rm %{buildroot}%{_libdir}/*.la
 %postun -p /sbin/ldconfig
 
 %check
-%ifarch s390 s390x aarch64
-make check ||:
-%else
 make check
-%endif
 
 %clean
 rm -rf %{buildroot} 
@@ -105,6 +104,9 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Wed Aug 24 2016 Dan Horák <dan[at]danny.cz> - 2.3.15-5
+- fix precision issue on s390(x) and aarch64 (#1076070)
+
 * Thu Feb 04 2016 Fedora Release Engineering <releng@fedoraproject.org> - 2.3.15-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_24_Mass_Rebuild