diff --git a/cmake/system.cmake b/cmake/system.cmake
index 18b2c3b87a..95bb60d380 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -13,6 +13,10 @@ if(CMAKE_CROSSCOMPILING AND NOT DEFINED TARGET)
     set(TARGET "ARMV8")
   elseif(ARM)
     set(TARGET "ARMV7") # TODO: Ask compiler which arch this is
+  elseif(X86_64)
+    set(TARGET "PENRYN")
+  elseif(X86)
+    set(TARGET "CORE2")
   else()
     message(FATAL_ERROR "When cross compiling, a TARGET is required.")
   endif()