diff --git a/src/rct2.c b/src/rct2.c
index 39b939e420..90674252b7 100644
--- a/src/rct2.c
+++ b/src/rct2.c
@@ -355,7 +355,7 @@ void get_system_info()
 	else
 		RCT2_GLOBAL(0x1423C18, sint32) = 1;
 
-	RCT2_GLOBAL(0x01423C20, uint32) = RCT2_CALLFUNC(0x406993, uint32); // cpu_has_mmx()
+	RCT2_GLOBAL(0x01423C20, uint32) = (SDL_HasMMX() == SDL_TRUE);
 }