diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -2583,7 +2583,7 @@ struct IndustryCargoesWindow : public Wi
 					delete lst;
 					break;
 				}
-				int selected = (this->ind_cargo >= NUM_INDUSTRYTYPES) ? this->ind_cargo - NUM_INDUSTRYTYPES : -1;
+				int selected = (this->ind_cargo >= NUM_INDUSTRYTYPES) ? (int)(this->ind_cargo - NUM_INDUSTRYTYPES) : -1;
 				ShowDropDownList(this, lst, selected, WID_IC_CARGO_DROPDOWN, 0, true);
 				break;
 			}
@@ -2600,7 +2600,7 @@ struct IndustryCargoesWindow : public Wi
 					delete lst;
 					break;
 				}
-				int selected = (this->ind_cargo < NUM_INDUSTRYTYPES) ? this->ind_cargo : -1;
+				int selected = (this->ind_cargo < NUM_INDUSTRYTYPES) ? (int)this->ind_cargo : -1;
 				ShowDropDownList(this, lst, selected, WID_IC_IND_DROPDOWN, 0, true);
 				break;
 			}