diff --git a/BizHawk.MultiClient/config/InputWidget.cs b/BizHawk.MultiClient/config/InputWidget.cs
index 1b23ab4165..e99a8d2998 100644
--- a/BizHawk.MultiClient/config/InputWidget.cs
+++ b/BizHawk.MultiClient/config/InputWidget.cs
@@ -78,13 +78,27 @@ namespace BizHawk.MultiClient
 				if (TempBindingStr == "Alt+F4")
 					return;
 
-				Bindings[pos] = TempBindingStr;
-				wasPressed = TempBindingStr;
-				UpdateLabel();
-				Increment();
+				if (!IsDuplicate(TempBindingStr))
+				{
+					Bindings[pos] = TempBindingStr;
+					wasPressed = TempBindingStr;
+					UpdateLabel();
+					Increment();
+				}
 			}
 		}
 
+		public bool IsDuplicate(string binding)
+		{
+			for (int x = 0; x < MaxBind; x++)
+			{
+				if (Bindings[x] == binding)
+					return true;
+			}
+
+			return false;
+		}
+
 		protected override void OnKeyUp(KeyEventArgs e)
 		{
 			if (e.KeyCode == Keys.F4 && e.Modifiers == Keys.Alt)