diff --git a/components/compiler/extensions0.cpp b/components/compiler/extensions0.cpp
index 5bec1bca14..cfa8c4667b 100644
--- a/components/compiler/extensions0.cpp
+++ b/components/compiler/extensions0.cpp
@@ -116,7 +116,7 @@ namespace Compiler
         void registerExtensions (Extensions& extensions)
         {
             extensions.registerInstruction ("additem", "clX", opcodeAddItem, opcodeAddItemExplicit);
-            extensions.registerFunction ("getitemcount", 'l', "c", opcodeGetItemCount,
+            extensions.registerFunction ("getitemcount", 'l', "cX", opcodeGetItemCount,
                 opcodeGetItemCountExplicit);
             extensions.registerInstruction ("removeitem", "clX", opcodeRemoveItem,
                 opcodeRemoveItemExplicit);