diff --git a/src/ui/viewmodels/TriggerConditionViewModel.cpp b/src/ui/viewmodels/TriggerConditionViewModel.cpp
index 4c43f3b8..3e01bffe 100644
--- a/src/ui/viewmodels/TriggerConditionViewModel.cpp
+++ b/src/ui/viewmodels/TriggerConditionViewModel.cpp
@@ -225,8 +225,8 @@ void TriggerConditionViewModel::SerializeAppendOperand(std::string& sBuffer, Tri
         case TriggerOperandType::Recall:
         {
             std::string recall = "{recall}";
-            for ( int i = 0; i < (int)recall.length(); i++) {
-                sBuffer.push_back(recall[i]);
+            for (size_t i = 0; i < recall.length(); i++) {
+                sBuffer.push_back(recall.at(i));
             }
             return;
         }