diff --git a/cryptonite.cabal b/cryptonite.cabal
index 7571d05..9d5a343 100644
--- a/cryptonite.cabal
+++ b/cryptonite.cabal
@@ -238,8 +238,10 @@ Library
   if arch(i386)
     CPP-options: -DARCH_X86
 
-  if flag(support_rdrand) && arch(x86_64)
-    CPP-options:    -DARCH_X86_64
+  if arch(x86_64)
+    CPP-options: -DARCH_X86_64
+
+  if flag(support_rdrand)
     CPP-options:    -DSUPPORT_RDRAND
     Other-modules:  Crypto.Random.Entropy.RDRand
     c-sources:      cbits/cryptonite_rdrand.c