diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index 909e3ba5d8..ad9f9b9f64 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -57,7 +57,7 @@
 IndustryPool _industry_pool("Industry");
 INSTANTIATE_POOL_METHODS(Industry)
 
-void ShowIndustryViewWindow(int industry);
+void ShowIndustryViewWindow(IndustryID industry);
 void BuildOilRig(TileIndex tile);
 
 static uint8_t _industry_sound_ctr;
diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
index a2904e1aad..4b6d76dc07 100644
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -1243,7 +1243,7 @@ static WindowDesc _industry_view_desc(
 	_nested_industry_view_widgets
 );
 
-void ShowIndustryViewWindow(int industry)
+void ShowIndustryViewWindow(IndustryID industry)
 {
 	AllocateWindowDescFront<IndustryViewWindow>(_industry_view_desc, industry);
 }