diff --git a/src/arch/nano6502/nano6502.S b/src/arch/nano6502/nano6502.S
index 62aa840d..89d02927 100644
--- a/src/arch/nano6502/nano6502.S
+++ b/src/arch/nano6502/nano6502.S
@@ -942,7 +942,7 @@ zproc bios_WRITE
     sta sd_write_strobe
 
     jsr sd_wait   
-    
+    clc 
     rts
 zendproc