--- libgig/trunk/src/gig.cpp	2021/06/19 10:58:51	3960
+++ libgig/trunk/src/gig.cpp	2021/06/19 11:01:40	3961
@@ -5835,7 +5835,7 @@
      * @throws gig::Exception if given script @p slot index is invalid or given
      *         @p variable name is empty
      */
-    void Instrument::SetScriptPatchVariable(int slot, String variable, String value) {
+    void Instrument::SetScriptPatchVariable(size_t slot, String variable, String value) {
         if (variable.empty())
             throw Exception("Variable name must not be empty");
         Script* script = GetScriptOfSlot(slot);