diff --git a/COPASI.spec b/COPASI.spec
index 3487a04..cf87eca 100644
--- a/COPASI.spec
+++ b/COPASI.spec
@@ -388,7 +388,7 @@ export INCBLAS=%{_includedir}
  -DPREFER_STATIC:BOOL=OFF -DCMAKE_SKIP_RPATH:BOOL=YES ..
 
 ##'Parallel make' breaks builds
-%ifarch s390x
+%ifarch s390x %{arm}
 make -j1
 %else
 make -j4