diff --git a/python-cryptography.spec b/python-cryptography.spec
index e4f3235..f157ee4 100644
--- a/python-cryptography.spec
+++ b/python-cryptography.spec
@@ -25,6 +25,8 @@ Source3:        cryptography-%{version}-vendor.tar.bz2
 Source4:        conftest-skipper.py
 %endif
 
+ExclusiveArch:  %{rust_arches}
+
 BuildRequires:  openssl-devel
 BuildRequires:  gcc
 BuildRequires:  gnupg2