diff --git a/src/test/kc/examples/c64/irq/irq-hyperscreen.c b/src/test/kc/examples/c64/irq/irq-hyperscreen.c
index 147d78759..a3d8ee8b0 100644
--- a/src/test/kc/examples/c64/irq/irq-hyperscreen.c
+++ b/src/test/kc/examples/c64/irq/irq-hyperscreen.c
@@ -1,16 +1,16 @@
 // A raster IRQ that opens the top/bottom border.
 #include <c64.h>
 
-char* const GHOST_BYTE = (char*)$3fff;
+char* const GHOST_BYTE = (char*)0x3fff;
 
 void main() {
     *GHOST_BYTE = 0;
     asm { sei }
     // Disable CIA 1 Timer IRQ
     CIA1->INTERRUPT = CIA_INTERRUPT_CLEAR;
-    // Set raster line to $fa
-    VICII->CONTROL1 &=$7f;
-    VICII->RASTER = $fa;
+    // Set raster line to 0xfa
+    VICII->CONTROL1 &= 0x7f;
+    VICII->RASTER = 0xfa;
     // Enable Raster Interrupt
     VICII->IRQ_ENABLE = IRQ_RASTER;
     // Set the IRQ routine
@@ -27,11 +27,11 @@ void main() {
 __interrupt(hardware_clobber) void irq_bottom_1() {
     VICII->BORDER_COLOR = WHITE;
     // Set screen height to 24 lines - this is done after the border should have started drawing - so it wont start
-    VICII->CONTROL1 &= ($ff^VICII_RSEL);
+    VICII->CONTROL1 &= (0xff^VICII_RSEL);
     // Acknowledge the IRQ
     VICII->IRQ_STATUS = IRQ_RASTER;
-    // Trigger IRQ 2 at line $fd
-    VICII->RASTER = $fd;
+    // Trigger IRQ 2 at line 0xfd
+    VICII->RASTER = 0xfd;
     *HARDWARE_IRQ = &irq_bottom_2;
     VICII->BORDER_COLOR = RED;
 }
@@ -43,8 +43,8 @@ __interrupt(hardware_clobber) void irq_bottom_2() {
     VICII->CONTROL1 |= VICII_RSEL;
     // Acknowledge the IRQ
     VICII->IRQ_STATUS = IRQ_RASTER;
-    // Trigger IRQ 1 at line $fa
-    VICII->RASTER = $fa;
+    // Trigger IRQ 1 at line 0xfa
+    VICII->RASTER = 0xfa;
     *HARDWARE_IRQ = &irq_bottom_1;
     VICII->BORDER_COLOR = RED;
-}
\ No newline at end of file
+}