diff --git a/libsrc/cbm510/crt0.s b/libsrc/cbm510/crt0.s
index b89185335..78ad684db 100644
--- a/libsrc/cbm510/crt0.s
+++ b/libsrc/cbm510/crt0.s
@@ -540,7 +540,7 @@ irq:    pha
 
        	ldy    	irqcount
         beq     irqskip
-       	jsr    	callirq_q               ; Call the functions
+       	jsr    	callirq_y               ; Call the functions
 
 ; Done with chained IRQ handlers, check the TPI for IRQs and handle them