diff --git a/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySector.cs b/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySector.cs
index cffb61e..a57e872 100644
--- a/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySector.cs
+++ b/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySector.cs
@@ -1009,23 +1009,28 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			// toggle selected state
 			if (General.Interface.ShiftState ^ BuilderPlug.Me.AdditivePaintSelect)
 			{
-				this.selected = true;
-				mode.AddSelectedObject(this);
+				if (!selected)
+				{
+					selected = true;
+					mode.AddSelectedObject(this);
+				}
 			}
 			else if (General.Interface.CtrlState)
 			{
-				this.selected = false;
-				mode.RemoveSelectedObject(this);
-
+				if (selected)
+				{
+					selected = false;
+					mode.RemoveSelectedObject(this);
+				}
 			}
 			else
 			{
-				if (this.selected)
+				if (selected)
 					mode.RemoveSelectedObject(this);
 				else
 					mode.AddSelectedObject(this);
 
-				this.selected = !this.selected;
+				selected = !selected;
 			}
 		}
 		
diff --git a/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySidedef.cs b/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySidedef.cs
index bac8643..af5868e 100644
--- a/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySidedef.cs
+++ b/Source/Plugins/BuilderModes/VisualModes/BaseVisualGeometrySidedef.cs
@@ -1580,22 +1580,28 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			// toggle selected state
 			if (General.Interface.ShiftState ^ BuilderPlug.Me.AdditivePaintSelect)
 			{
-				this.selected = true;
-				mode.AddSelectedObject(this);
+				if (!selected)
+				{
+					selected = true;
+					mode.AddSelectedObject(this);
+				}
 			}
 			else if (General.Interface.CtrlState)
 			{
-				this.selected = false;
-				mode.RemoveSelectedObject(this);
+				if (selected)
+				{
+					selected = false;
+					mode.RemoveSelectedObject(this);
+				}
 			}
 			else
 			{
-				if (this.selected)
+				if (selected)
 					mode.RemoveSelectedObject(this);
 				else
 					mode.AddSelectedObject(this);
 
-				this.selected = !this.selected;
+				selected = !selected;
 			}
 		}
 
diff --git a/Source/Plugins/BuilderModes/VisualModes/BaseVisualThing.cs b/Source/Plugins/BuilderModes/VisualModes/BaseVisualThing.cs
index 454fcd0..dbbe627 100644
--- a/Source/Plugins/BuilderModes/VisualModes/BaseVisualThing.cs
+++ b/Source/Plugins/BuilderModes/VisualModes/BaseVisualThing.cs
@@ -931,22 +931,28 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			// toggle selected state
 			if (General.Interface.ShiftState ^ BuilderPlug.Me.AdditivePaintSelect)
 			{
-				this.selected = true;
-				mode.AddSelectedObject(this);
+				if (!selected)
+				{
+					selected = true;
+					mode.AddSelectedObject(this);
+				}
 			}
 			else if (General.Interface.CtrlState)
 			{
-				this.selected = false;
-				mode.RemoveSelectedObject(this);
+				if (selected)
+				{
+					selected = false;
+					mode.RemoveSelectedObject(this);
+				}
 			}
 			else
 			{
-				if (this.selected)
+				if (selected)
 					mode.RemoveSelectedObject(this);
 				else
 					mode.AddSelectedObject(this);
 
-				this.selected = !this.selected;
+				selected = !selected;
 			}
 		}