diff --git a/cmake/modules/DetectMachine.cmake b/cmake/modules/DetectMachine.cmake
index a9cde461e..f3458165b 100644
--- a/cmake/modules/DetectMachine.cmake
+++ b/cmake/modules/DetectMachine.cmake
@@ -19,8 +19,8 @@ MESSAGE("PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
 SET(LMMS_HOST_X86 FALSE)
 SET(LMMS_HOST_X86_64 FALSE)
 
-IF(NOT DEFINED WIN64)
-    STRING(REGEX MATCH "86_64|amd64|AMD64" WIN64 "${CMAKE_SYSTEM_PROCESSOR}")
+IF(NOT DEFINED WIN64 AND CMAKE_SIZEOF_VOID_P EQUAL 8)
+    SET(WIN64 ON)
 ENDIF()
 
 IF(WIN32)