diff --git a/third_party/cryptopp/CMakeLists.txt b/third_party/cryptopp/CMakeLists.txt
index 9c4100505..aa915e3fa 100644
--- a/third_party/cryptopp/CMakeLists.txt
+++ b/third_party/cryptopp/CMakeLists.txt
@@ -209,7 +209,10 @@ function(DumpMachine output pattern)
     set(${output} 0 PARENT_SCOPE)
 
   else ()
-      if(CMAKE_SYSTEM_PROCESSOR MATCHES ${pattern})
+      if("${CMAKE_OSX_ARCHITECTURES}" STREQUAL "" AND CMAKE_SYSTEM_PROCESSOR MATCHES ${pattern})
+          set(${output} TRUE PARENT_SCOPE)
+      endif()
+      if(CMAKE_OSX_ARCHITECTURES MATCHES ${pattern})
           set(${output} TRUE PARENT_SCOPE)
       endif()
   endif()