diff --git a/compiler/res/prog8lib/cx16/gfx2.p8 b/compiler/res/prog8lib/cx16/gfx2.p8
index bb9d6822c..6e7868662 100644
--- a/compiler/res/prog8lib/cx16/gfx2.p8
+++ b/compiler/res/prog8lib/cx16/gfx2.p8
@@ -653,6 +653,7 @@ _done
     }
 
     sub position(uword @zp x, uword y) {
+        ubyte bank
         when active_mode {
             1 -> {
                 ; lores monochrome
@@ -663,7 +664,8 @@ _done
             4 -> {
                 ; lores 256c
                 void addr_mul_24_for_lores_256c(y, x)      ; 24 bits result is in r0 and r1L (highest byte)
-                cx16.vaddr(lsb(cx16.r1), cx16.r0, 0, 1)
+                bank = lsb(cx16.r1)
+                cx16.vaddr(bank, cx16.r0, 0, 1)
             }
             5 -> {
                 ; highres monochrome
@@ -673,7 +675,8 @@ _done
             6 -> {
                 ; highres 4c
                 void addr_mul_24_for_highres_4c(y, x)      ; 24 bits result is in r0 and r1L (highest byte)
-                cx16.vaddr(lsb(cx16.r1), cx16.r0, 0, 1)
+                bank = lsb(cx16.r1)
+                cx16.vaddr(bank, cx16.r0, 0, 1)
             }
         }
     }
diff --git a/examples/test.p8 b/examples/test.p8
index 22a8ab335..7ce2204b6 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -4,6 +4,12 @@
 main {
 
     sub start() {
+        ubyte bank
+
+        ; TODO give error that a register is used as an argument value and at the same time is a register parameter taking a new value.
+        ;      (note: this is OK if the  register is used as an argument for a register param that is the same register)
+        cx16.vaddr(lsb(cx16.r1), cx16.r0, 0, 1)
+
         txt.print("hello")
     }
 }