diff --git a/bsnes/sfc/coprocessor/superfx/memory.cpp b/bsnes/sfc/coprocessor/superfx/memory.cpp
index f002a9cf..71b6f2e1 100644
--- a/bsnes/sfc/coprocessor/superfx/memory.cpp
+++ b/bsnes/sfc/coprocessor/superfx/memory.cpp
@@ -1,12 +1,13 @@
 auto SuperFX::read(uint addr, uint8 data) -> uint8 {
   if((addr & 0xc00000) == 0x000000) {  //$00-3f:0000-7fff,:8000-ffff
-    addr =  Bus::mirror(addr, rom.size());
     while(!regs.scmr.ron) {
       step(6);
       synchronizeCPU();
       if(synchronizing()) break;
     }
-    return rom.read((((addr & 0x3f0000) >> 1) | (addr & 0x7fff)));
+    addr = (((addr & 0x3f0000) >> 1) | (addr & 0x7fff));
+    addr = Bus::mirror(addr, rom.size());
+    return rom.read(addr);
   }
 
   if((addr & 0xe00000) == 0x400000) {  //$40-5f:0000-ffff