diff --git a/src/asm/6502/stream.s b/src/asm/6502/stream.s
index ce98bbc8f..b96b42c61 100644
--- a/src/asm/6502/stream.s
+++ b/src/asm/6502/stream.s
@@ -506,6 +506,7 @@ fcsChannelPost:
     bpl fcsChanPlus
     fcsChanMinus:
       ; if (chanVol[x]<0)
+      bcc fcs
       jmp fcsChanDoPitch
     fcsChanPlus:
       ; if (chanVol[x]>=fcsVolMax[x] || CARRY)