diff --git a/spacetaxi.c b/spacetaxi.c
index 10232d6..c52c47e 100644
--- a/spacetaxi.c
+++ b/spacetaxi.c
@@ -978,7 +978,7 @@ int main(void) {
     // gets one; whatever does not fit draws interpreted). The 68k ports'
     // cels are far larger (9-13 KB each) and their JIT is fast, so they
     // keep a modest arena and compile at level entry.
-#if defined(JOEYLIB_PLATFORM_IIGS) || defined(JOEYLIB_PLATFORM_DOS)
+#if defined(JOEYLIB_PLATFORM_IIGS) || defined(JOEYLIB_CPU_X86)
     config.codegenBytes = 256UL * 1024;
 #else
     config.codegenBytes = 160UL * 1024;