diff --git a/src/openrct2/windows/clear_scenery.c b/src/openrct2/windows/clear_scenery.c
index 0c4bb50535..4a2ce6f8d4 100644
--- a/src/openrct2/windows/clear_scenery.c
+++ b/src/openrct2/windows/clear_scenery.c
@@ -54,7 +54,7 @@ rct_widget window_clear_scenery_widgets[] = {
 
 static void window_clear_scenery_close(rct_window *w);
 static void window_clear_scenery_mouseup(rct_window *w, rct_widgetindex widgetIndex);
-static void window_clear_scenery_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget *widget);
+static void window_clear_scenery_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget *widget);
 static void window_clear_scenery_update(rct_window *w);
 static void window_clear_scenery_invalidate(rct_window *w);
 static void window_clear_scenery_paint(rct_window *w, rct_drawpixelinfo *dpi);
@@ -159,7 +159,7 @@ static void window_clear_scenery_mouseup(rct_window *w, rct_widgetindex widgetIn
     }
 }
 
-static void window_clear_scenery_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget *widget)
+static void window_clear_scenery_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget *widget)
 {
     switch (widgetIndex) {
     case WIDX_DECREMENT:
diff --git a/src/openrct2/windows/land_rights.c b/src/openrct2/windows/land_rights.c
index f8a547d57f..078d1ff2c1 100644
--- a/src/openrct2/windows/land_rights.c
+++ b/src/openrct2/windows/land_rights.c
@@ -53,7 +53,7 @@ static rct_widget window_land_rights_widgets[] = {
 
 static void window_land_rights_close(rct_window *w);
 static void window_land_rights_mouseup(rct_window *w, rct_widgetindex widgetIndex);
-static void window_land_rights_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget *widget);
+static void window_land_rights_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget *widget);
 static void window_land_rights_update(rct_window *w);
 static void window_land_rights_invalidate(rct_window *w);
 static void window_land_rights_paint(rct_window *w, rct_drawpixelinfo *dpi);
@@ -178,7 +178,7 @@ static void window_land_rights_mouseup(rct_window *w, rct_widgetindex widgetInde
     }
 }
 
-static void window_land_rights_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget *widget)
+static void window_land_rights_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget *widget)
 {
     switch (widgetIndex) {
     case WIDX_DECREMENT:
diff --git a/src/openrct2/windows/water.c b/src/openrct2/windows/water.c
index 82eae1ad21..9fd8f2deb0 100644
--- a/src/openrct2/windows/water.c
+++ b/src/openrct2/windows/water.c
@@ -47,7 +47,7 @@ static rct_widget window_water_widgets[] = {
 
 static void window_water_close(rct_window *w);
 static void window_water_mouseup(rct_window *w, rct_widgetindex widgetIndex);
-static void window_water_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget *widget);
+static void window_water_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget *widget);
 static void window_water_update(rct_window *w);
 static void window_water_invalidate(rct_window *w);
 static void window_water_paint(rct_window *w, rct_drawpixelinfo *dpi);
@@ -144,7 +144,7 @@ static void window_water_mouseup(rct_window *w, rct_widgetindex widgetIndex)
     }
 }
 
-static void window_water_mousedown(rct_widgetindex widgetIndex, rct_window *w, rct_widget* widget)
+static void window_water_mousedown(rct_window *w, rct_widgetindex widgetIndex, rct_widget* widget)
 {
     switch (widgetIndex) {
     case WIDX_DECREMENT: