diff --git a/libsrc/runtime/callptr4.s b/libsrc/runtime/callptr4.s
new file mode 100644
index 000000000..9a15609aa
--- /dev/null
+++ b/libsrc/runtime/callptr4.s
@@ -0,0 +1,10 @@
+;
+; CC65 runtime: call function via pointer in ptr4
+;
+
+        .export         callptr4
+        .importzp       ptr4
+
+callptr4:
+        jmp     (ptr4)          ; jump there
+