diff --git a/dlls/mshtml/htmldoc.c b/dlls/mshtml/htmldoc.c
index 203cc5159d4..2b660df7be8 100644
--- a/dlls/mshtml/htmldoc.c
+++ b/dlls/mshtml/htmldoc.c
@@ -2042,7 +2042,7 @@ static HRESULT WINAPI HTMLDocument3_detachEvent(IHTMLDocument3 *iface, BSTR even
 
     TRACE("(%p)->(%s %p)\n", This, debugstr_w(event), pDisp);
 
-    return detach_event(&This->doc_node->node.event_target, This, event, pDisp);
+    return detach_event(&This->doc_node->node.event_target, event, pDisp);
 }
 
 static HRESULT WINAPI HTMLDocument3_put_onrowsdelete(IHTMLDocument3 *iface, VARIANT v)
diff --git a/dlls/mshtml/htmlelem.c b/dlls/mshtml/htmlelem.c
index 42778906bba..ae2eeee1c32 100644
--- a/dlls/mshtml/htmlelem.c
+++ b/dlls/mshtml/htmlelem.c
@@ -2575,7 +2575,7 @@ static HRESULT WINAPI HTMLElement2_detachEvent(IHTMLElement2 *iface, BSTR event,
 
     TRACE("(%p)->(%s %p)\n", This, debugstr_w(event), pDisp);
 
-    return detach_event(&This->node.event_target, &This->node.doc->basedoc, event, pDisp);
+    return detach_event(&This->node.event_target, event, pDisp);
 }
 
 static HRESULT WINAPI HTMLElement2_get_readyState(IHTMLElement2 *iface, VARIANT *p)
diff --git a/dlls/mshtml/htmlevent.c b/dlls/mshtml/htmlevent.c
index d359e4af2a6..4bc984785a9 100644
--- a/dlls/mshtml/htmlevent.c
+++ b/dlls/mshtml/htmlevent.c
@@ -1520,7 +1520,7 @@ HRESULT attach_event(EventTarget *event_target, BSTR name, IDispatch *disp, VARI
     return S_OK;
 }
 
-HRESULT detach_event(EventTarget *event_target, HTMLDocument *doc, BSTR name, IDispatch *disp)
+HRESULT detach_event(EventTarget *event_target, BSTR name, IDispatch *disp)
 {
     event_target_t *data;
     eventid_t eid;
diff --git a/dlls/mshtml/htmlevent.h b/dlls/mshtml/htmlevent.h
index e10a87d3de1..3946243b191 100644
--- a/dlls/mshtml/htmlevent.h
+++ b/dlls/mshtml/htmlevent.h
@@ -57,7 +57,7 @@ void fire_event(HTMLDocumentNode*,eventid_t,BOOL,nsIDOMNode*,nsIDOMEvent*,IDispa
 HRESULT set_event_handler(EventTarget*,HTMLDocumentNode*,eventid_t,VARIANT*) DECLSPEC_HIDDEN;
 HRESULT get_event_handler(EventTarget*,eventid_t,VARIANT*) DECLSPEC_HIDDEN;
 HRESULT attach_event(EventTarget*,BSTR,IDispatch*,VARIANT_BOOL*) DECLSPEC_HIDDEN;
-HRESULT detach_event(EventTarget*,HTMLDocument*,BSTR,IDispatch*) DECLSPEC_HIDDEN;
+HRESULT detach_event(EventTarget*,BSTR,IDispatch*) DECLSPEC_HIDDEN;
 HRESULT dispatch_event(HTMLDOMNode*,const WCHAR*,VARIANT*,VARIANT_BOOL*) DECLSPEC_HIDDEN;
 HRESULT call_fire_event(HTMLDOMNode*,eventid_t) DECLSPEC_HIDDEN;
 void update_doc_cp_events(HTMLDocumentNode*,cp_static_data_t*) DECLSPEC_HIDDEN;
diff --git a/dlls/mshtml/htmlwindow.c b/dlls/mshtml/htmlwindow.c
index d38e704c241..9f9e3419111 100644
--- a/dlls/mshtml/htmlwindow.c
+++ b/dlls/mshtml/htmlwindow.c
@@ -1669,7 +1669,7 @@ static HRESULT WINAPI HTMLWindow3_detachEvent(IHTMLWindow3 *iface, BSTR event, I
         return E_FAIL;
     }
 
-    return detach_event(&window->event_target, &window->doc->basedoc, event, pDisp);
+    return detach_event(&window->event_target, event, pDisp);
 }
 
 static HRESULT window_set_timer(HTMLInnerWindow *This, VARIANT *expr, LONG msec, VARIANT *language,