diff --git a/src/main_gui.cpp b/src/main_gui.cpp
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -166,9 +166,8 @@ bool DoZoomInOutWindow(int how, Window *
 		vp->virtual_left = w->viewport->scrollpos_x;
 		vp->virtual_top = w->viewport->scrollpos_y;
 	}
-	w->SetDirty();
 	/* Update the windows that have zoom-buttons to perhaps disable their buttons */
-	InvalidateThisWindowData(w);
+	w->InvalidateData();
 	return true;
 }
 
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -344,7 +344,7 @@ public:
 					this->sel = NULL;
 					this->sel_pos = -1;
 				}
-				InvalidateThisWindowData(this, 1);
+				this->InvalidateData(1);
 				break;
 			}
 
@@ -379,7 +379,7 @@ public:
 
 			case ANGRFW_RESCAN: // Rescan list
 				ScanNewGRFFiles();
-				InvalidateThisWindowData(this, 0);
+				this->InvalidateData();
 				break;
 		}
 	}
@@ -437,8 +437,7 @@ public:
 			this->sel = this->grfs[this->sel_pos];
 
 			this->ScrollToSelected();
-
-			InvalidateThisWindowData(this, 1);
+			this->InvalidateData(1);
 		}
 
 		return ES_HANDLED;
@@ -448,7 +447,7 @@ public:
 	{
 		this->grfs.SetFilterState(!StrEmpty(this->edit_str_buf));
 		this->grfs.ForceRebuild();
-		InvalidateThisWindowData(this, 1);
+		this->InvalidateData(1);
 	}
 };
 
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -663,7 +663,7 @@ static inline void ChangeVehicleWindow(W
 	if (w != NULL) {
 		w->window_number = to_index;
 		if (w->viewport != NULL) w->viewport->follow_vehicle = to_index;
-		if (to_index != INVALID_VEHICLE) InvalidateThisWindowData(w, 0);
+		if (to_index != INVALID_VEHICLE) w->InvalidateData();
 	}
 }
 
diff --git a/src/window.cpp b/src/window.cpp
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -2477,17 +2477,6 @@ void SetWindowClassesDirty(WindowClass c
 }
 
 /**
- * Mark window data as invalid (in need of re-computing)
- * @param w Window with invalid data
- * @param data The data to invalidate with
- */
-void InvalidateThisWindowData(Window *w, int data)
-{
-	w->OnInvalidateData(data);
-	w->SetDirty();
-}
-
-/**
  * Mark window data of the window of a given class and specific window number as invalid (in need of re-computing)
  * @param cls Window class
  * @param number Window number within the class
@@ -2497,7 +2486,7 @@ void InvalidateWindowData(WindowClass cl
 {
 	Window *w;
 	FOR_ALL_WINDOWS_FROM_BACK(w) {
-		if (w->window_class == cls && w->window_number == number) InvalidateThisWindowData(w, data);
+		if (w->window_class == cls && w->window_number == number) w->InvalidateData(data);
 	}
 }
 
@@ -2511,7 +2500,7 @@ void InvalidateWindowClassesData(WindowC
 	Window *w;
 
 	FOR_ALL_WINDOWS_FROM_BACK(w) {
-		if (w->window_class == cls) InvalidateThisWindowData(w, data);
+		if (w->window_class == cls) w->InvalidateData(data);
 	}
 }
 
diff --git a/src/window_func.h b/src/window_func.h
--- a/src/window_func.h
+++ b/src/window_func.h
@@ -27,7 +27,6 @@ void ResetWindowSystem();
 void SetupColoursAndInitialWindow();
 void InputLoop();
 
-void InvalidateThisWindowData(Window *w, int data = 0);
 void InvalidateWindowData(WindowClass cls, WindowNumber number, int data = 0);
 void InvalidateWindowClassesData(WindowClass cls, int data = 0);
 
diff --git a/src/window_gui.h b/src/window_gui.h
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -634,6 +634,16 @@ public:
 	void SetDirty() const;
 	void ReInit();
 
+	/**
+	 * Mark this window's data as invalid (in need of re-computing)
+	 * @param data The data to invalidate with
+	 */
+	void InvalidateData(int data = 0)
+	{
+		this->SetDirty();
+		this->OnInvalidateData(data);
+	}
+
 	/*** Event handling ***/
 
 	/**