diff --git a/src/libsrc/fiber.pla b/src/libsrc/fiber.pla
index 92e3d83..e137931 100644
--- a/src/libsrc/fiber.pla
+++ b/src/libsrc/fiber.pla
@@ -66,8 +66,7 @@ asm fbrSwap(saveVM, restoreVM)
     STA ESTK,Y
     DEY
     BPL -
-+   TXA
-    TAY
+    LDY HWSP
 -   LDA $100,Y
     STA (DST),Y
     INY