diff --git a/.gitattributes b/.gitattributes
index 4b7c4f85b3..f5144330bc 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -8623,6 +8623,7 @@ tests/webtbs/tw1066a.pp svneol=native#text/plain
 tests/webtbs/tw1066b.pp svneol=native#text/plain
 tests/webtbs/tw1068.pp svneol=native#text/plain
 tests/webtbs/tw10681.pp svneol=native#text/plain
+tests/webtbs/tw10684.pp svneol=native#text/plain
 tests/webtbs/tw1071.pp svneol=native#text/plain
 tests/webtbs/tw10727.pp svneol=native#text/plain
 tests/webtbs/tw1073.pp svneol=native#text/plain
diff --git a/compiler/i386/cgcpu.pas b/compiler/i386/cgcpu.pas
index 269a111118..d2bd151e3e 100644
--- a/compiler/i386/cgcpu.pas
+++ b/compiler/i386/cgcpu.pas
@@ -563,7 +563,7 @@ unit cgcpu;
 
       }
 
-        procedure getselftoeax(offs: longint);
+      procedure getselftoeax(offs: longint);
         var
           href : treference;
           selfoffsetfromsp : longint;
@@ -581,7 +581,7 @@ unit cgcpu;
             end;
         end;
 
-        procedure loadvmttoeax;
+      procedure loadvmttoeax;
         var
           href : treference;
         begin
@@ -590,7 +590,7 @@ unit cgcpu;
           cg.a_load_ref_reg(list,OS_ADDR,OS_ADDR,href,NR_EAX);
         end;
 
-        procedure op_oneaxmethodaddr(op: TAsmOp);
+      procedure op_oneaxmethodaddr(op: TAsmOp);
         var
           href : treference;
         begin
@@ -601,7 +601,7 @@ unit cgcpu;
           list.concat(taicpu.op_ref(op,S_L,href));
         end;
 
-        procedure loadmethodoffstoeax;
+      procedure loadmethodoffstoeax;
         var
           href : treference;
         begin
@@ -633,9 +633,9 @@ unit cgcpu;
           make_global:=true;
 
         if make_global then
-         List.concat(Tai_symbol.Createname_global(labelname,AT_FUNCTION,0))
+          List.concat(Tai_symbol.Createname_global(labelname,AT_FUNCTION,0))
         else
-        List.concat(Tai_symbol.Createname(labelname,AT_FUNCTION,0));
+          List.concat(Tai_symbol.Createname(labelname,AT_FUNCTION,0));
 
         { set param1 interface to self  }
         g_adjust_self_value(list,procdef,ioffset);
@@ -657,6 +657,7 @@ unit cgcpu;
               end;
             { restore param1 value self to interface }
             g_adjust_self_value(list,procdef,-ioffset);
+            list.concat(taicpu.op_none(A_RET,S_L));
           end
         else if po_virtualmethod in procdef.procoptions then
           begin
diff --git a/tests/webtbs/tw10684.pp b/tests/webtbs/tw10684.pp
new file mode 100644
index 0000000000..52dcac4f7a
--- /dev/null
+++ b/tests/webtbs/tw10684.pp
@@ -0,0 +1,48 @@
+program test_intf_query;
+
+{$IFDEF FPC}
+  {$MODE OBJFPC}{$H+}
+{$ENDIF}
+
+uses
+  Classes;
+
+type
+  ISimple = interface
+  ['{24811FF3-4F01-4601-AC5C-22A5B5D46928}']
+    function ShowSomething: Integer; cdecl;
+    function GetIsBlob: Boolean; cdecl;
+  end;
+
+  TSimple = class(TInterfacedObject, ISimple)
+  protected
+    { ISimple implementation }
+    function ShowSomething: Integer; cdecl;
+    function GetIsBlob: Boolean; cdecl;
+  end;
+
+function QuerySimple(const OnChange: TNotifyEvent = nil): ISimple; cdecl;
+begin
+  Result := TSimple.Create;
+end;
+
+function TSimple.ShowSomething: Integer; cdecl;
+begin
+  Writeln('Message from ISimple');
+  Result := 0;
+end;
+
+function TSimple.GetIsBlob: Boolean; cdecl;
+begin
+  Result := true;
+end;
+
+{*** main program ***}
+
+var
+  FSimple: ISimple;
+
+begin
+  FSimple := QuerySimple;
+  FSimple.ShowSomething;
+end.
\ No newline at end of file