diff --git a/src/script/api/game/game_window.hpp.sq b/src/script/api/game/game_window.hpp.sq
--- a/src/script/api/game/game_window.hpp.sq
+++ b/src/script/api/game/game_window.hpp.sq
@@ -1020,7 +1020,6 @@ void SQGSWindow_Register(Squirrel *engin
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_SIL_SCROLLBAR,                         "WID_SIL_SCROLLBAR");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_SIL_FILTER_TEXT,                       "WID_SIL_FILTER_TEXT");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_SIL_FILTER_MATCH_CASE_BTN,             "WID_SIL_FILTER_MATCH_CASE_BTN");
-	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_SIL_FILTER_CLEAR_BTN,                  "WID_SIL_FILTER_CLEAR_BTN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_SIL_FILTER_ENTER_BTN,                  "WID_SIL_FILTER_ENTER_BTN");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_QES_CAPTION,                           "WID_QES_CAPTION");
 	SQGSWindow.DefSQConst(engine, ScriptWindow::WID_QES_TEXT,                              "WID_QES_TEXT");
diff --git a/src/script/api/script_window.hpp b/src/script/api/script_window.hpp
--- a/src/script/api/script_window.hpp
+++ b/src/script/api/script_window.hpp
@@ -2143,7 +2143,6 @@ public:
 		WID_SIL_SCROLLBAR                            = ::WID_SIL_SCROLLBAR,                            ///< Scrollbar of list.
 		WID_SIL_FILTER_TEXT                          = ::WID_SIL_FILTER_TEXT,                          ///< Text box for typing a filter string.
 		WID_SIL_FILTER_MATCH_CASE_BTN                = ::WID_SIL_FILTER_MATCH_CASE_BTN,                ///< Button to toggle if case sensitive filtering should be used.
-		WID_SIL_FILTER_CLEAR_BTN                     = ::WID_SIL_FILTER_CLEAR_BTN,                     ///< Button to clear the filter.
 		WID_SIL_FILTER_ENTER_BTN                     = ::WID_SIL_FILTER_ENTER_BTN,                     ///< Scroll to first sign.
 	};
 
diff --git a/src/signs_gui.cpp b/src/signs_gui.cpp
--- a/src/signs_gui.cpp
+++ b/src/signs_gui.cpp
@@ -172,17 +172,6 @@ struct SignListWindow : Window, SignList
 	}
 
 	/**
-	 * Empties the string buffer that is edited by the filter text edit widget.
-	 * It also triggers the redraw of the widget so it become visible that the string has been made empty.
-	 */
-	void ClearFilterTextWidget()
-	{
-		this->filter_editbox.text.DeleteAll();
-
-		this->SetWidgetDirty(WID_SIL_FILTER_TEXT);
-	}
-
-	/**
 	 * This function sets the filter string of the sign list. The contents of
 	 * the edit widget is not updated by this function. Depending on if the
 	 * new string is zero-length or not the clear button is made
@@ -192,10 +181,6 @@ struct SignListWindow : Window, SignList
 	{
 		/* check if there is a new filter string */
 		this->string_filter.SetFilterTerm(new_filter_string);
-		this->SetWidgetDisabledState(WID_SIL_FILTER_CLEAR_BTN, StrEmpty(new_filter_string));
-
-		/* Repaint the clear button since its disabled state may have changed */
-		this->SetWidgetDirty(WID_SIL_FILTER_CLEAR_BTN);
 
 		/* Rebuild the list of signs */
 		this->InvalidateData();
@@ -263,11 +248,6 @@ struct SignListWindow : Window, SignList
 				}
 				break;
 
-			case WID_SIL_FILTER_CLEAR_BTN:
-				this->ClearFilterTextWidget(); // Empty the text in the EditBox widget
-				this->SetFilterString("");     // Use empty text as filter text (= view all signs)
-				break;
-
 			case WID_SIL_FILTER_MATCH_CASE_BTN:
 				SignList::match_case = !SignList::match_case; // Toggle match case
 				this->SetWidgetLoweredState(WID_SIL_FILTER_MATCH_CASE_BTN, SignList::match_case); // Toggle button pushed state
@@ -379,7 +359,6 @@ static const NWidgetPart _nested_sign_li
 							SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
 				EndContainer(),
 				NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_SIL_FILTER_MATCH_CASE_BTN), SetDataTip(STR_SIGN_LIST_MATCH_CASE, STR_SIGN_LIST_MATCH_CASE_TOOLTIP),
-				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SIL_FILTER_CLEAR_BTN), SetDataTip(STR_SIGN_LIST_CLEAR, STR_SIGN_LIST_CLEAR_TOOLTIP),
 			EndContainer(),
 		EndContainer(),
 		NWidget(NWID_VERTICAL),
diff --git a/src/widgets/sign_widget.h b/src/widgets/sign_widget.h
--- a/src/widgets/sign_widget.h
+++ b/src/widgets/sign_widget.h
@@ -20,7 +20,6 @@ enum SignListWidgets {
 	WID_SIL_SCROLLBAR,             ///< Scrollbar of list.
 	WID_SIL_FILTER_TEXT,           ///< Text box for typing a filter string.
 	WID_SIL_FILTER_MATCH_CASE_BTN, ///< Button to toggle if case sensitive filtering should be used.
-	WID_SIL_FILTER_CLEAR_BTN,      ///< Button to clear the filter.
 	WID_SIL_FILTER_ENTER_BTN,      ///< Scroll to first sign.
 };