diff --git a/arbor.spec b/arbor.spec
index d48b2de..b4a120a 100644
--- a/arbor.spec
+++ b/arbor.spec
@@ -37,8 +37,10 @@ License:        BSD
 
 Patch1:         0001-Quote-various-cmake-var-values.patch
 
-# Random123 does not support these
-ExcludeArch:    mips64r2 mips32r2 s390
+# Random123 does not support:
+#   mips64r2 mips32r2 s390
+# https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval
+ExcludeArch:    mips64r2 mips32r2 s390 %{ix86}
 
 BuildRequires:  cmake
 BuildRequires:  make