diff --git a/src/emu/cpu/superfx/superfx.c b/src/emu/cpu/superfx/superfx.c
index 236a5c21458..b5744adeaa1 100644
--- a/src/emu/cpu/superfx/superfx.c
+++ b/src/emu/cpu/superfx/superfx.c
@@ -547,6 +547,7 @@ void superfx_mmio_write(const device_config *cpu, UINT32 addr, UINT8 data)
 	if(addr >= 0x3100 && addr <= 0x32ff)
 	{
 		superfx_cache_mmio_write(cpustate, addr - 0x3100, data);
+		return;
 	}
 
 	if(addr >= 0x3000 && addr <= 0x301f)