diff --git a/libraries/AP_Scripting/generator/src/main.c b/libraries/AP_Scripting/generator/src/main.c
index 971d6ffcd1..b0575b1ab5 100644
--- a/libraries/AP_Scripting/generator/src/main.c
+++ b/libraries/AP_Scripting/generator/src/main.c
@@ -673,7 +673,7 @@ void handle_operator(struct userdata *data) {
     error(ERROR_USERDATA, "Needed a symbol for the operator");
   }
 
-  enum operator_type operation;
+  enum operator_type operation = OP_ADD;
   if (strcmp(operator, "+") == 0) {
     operation = OP_ADD;
   } else if (strcmp(operator, "-") == 0) {