diff --git a/python-PyCBC.spec b/python-PyCBC.spec
index cfef978..b6b2510 100644
--- a/python-PyCBC.spec
+++ b/python-PyCBC.spec
@@ -31,6 +31,7 @@ BuildRequires:  fdupes
 BuildRequires:  %{python_module numpy >= 1.16.0}
 BuildRequires:  %{python_module numpy-devel >= 1.16.0}
 Requires:       python-numpy >= 1.16.0
+ExclusiveArch:  %ix86 x86_64
 
 %python_subpackages