diff --git a/cmake/externals/openvr/CMakeLists.txt b/cmake/externals/openvr/CMakeLists.txt
index dea59f41a0..f9d0ef5a71 100644
--- a/cmake/externals/openvr/CMakeLists.txt
+++ b/cmake/externals/openvr/CMakeLists.txt
@@ -25,9 +25,14 @@ set(${EXTERNAL_NAME_UPPER}_INCLUDE_DIRS ${SOURCE_DIR}/headers CACHE TYPE INTERNA
 
 if (WIN32)
 
-  # FIXME need to account for different architectures 
-  set(${EXTERNAL_NAME_UPPER}_LIBRARIES ${SOURCE_DIR}/lib/win32/openvr_api.lib CACHE TYPE INTERNAL)
-  add_paths_to_fixup_libs(${SOURCE_DIR}/bin/win32)
+  # FIXME need to account for different architectures
+  if ("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+    set(${EXTERNAL_NAME_UPPER}_LIBRARIES ${SOURCE_DIR}/lib/win64/openvr_api.lib CACHE TYPE INTERNAL)
+    add_paths_to_fixup_libs(${SOURCE_DIR}/bin/win64)
+  else()
+    set(${EXTERNAL_NAME_UPPER}_LIBRARIES ${SOURCE_DIR}/lib/win32/openvr_api.lib CACHE TYPE INTERNAL)
+    add_paths_to_fixup_libs(${SOURCE_DIR}/bin/win32)
+  endif()
 
 elseif(APPLE)
 
diff --git a/cmake/externals/sdl2/CMakeLists.txt b/cmake/externals/sdl2/CMakeLists.txt
index decd1c6906..ee1d57d2e9 100644
--- a/cmake/externals/sdl2/CMakeLists.txt
+++ b/cmake/externals/sdl2/CMakeLists.txt
@@ -66,8 +66,15 @@ if (APPLE)
 elseif (WIN32)
   ExternalProject_Get_Property(${EXTERNAL_NAME} SOURCE_DIR)
   set(${EXTERNAL_NAME_UPPER}_INCLUDE_DIR ${SOURCE_DIR}/include CACHE PATH "Location of SDL2 include directory")
-  set(${EXTERNAL_NAME_UPPER}_LIBRARY_TEMP ${SOURCE_DIR}/lib/x86/SDL2.lib CACHE FILEPATH "Path to SDL2 library")
-  set(${EXTERNAL_NAME_UPPER}_DLL_PATH ${SOURCE_DIR}/lib/x86 CACHE PATH "Location of SDL2 DLL")
+
+  if ("${CMAKE_SIZEOF_VOID_P}" EQUAL "8")
+    set(${EXTERNAL_NAME_UPPER}_LIBRARY_TEMP ${SOURCE_DIR}/lib/x64/SDL2.lib CACHE FILEPATH "Path to SDL2 library")
+    set(${EXTERNAL_NAME_UPPER}_DLL_PATH ${SOURCE_DIR}/lib/x64 CACHE PATH "Location of SDL2 DLL")
+  else()
+    set(${EXTERNAL_NAME_UPPER}_LIBRARY_TEMP ${SOURCE_DIR}/lib/x86/SDL2.lib CACHE FILEPATH "Path to SDL2 library")
+    set(${EXTERNAL_NAME_UPPER}_DLL_PATH ${SOURCE_DIR}/lib/x86 CACHE PATH "Location of SDL2 DLL")
+  endif()
+  
 else ()
   ExternalProject_Get_Property(${EXTERNAL_NAME} INSTALL_DIR)
   set(${EXTERNAL_NAME_UPPER}_INCLUDE_DIR ${INSTALL_DIR}/include/SDL2 CACHE PATH "Location of SDL2 include directory")