diff --git a/dlls/setupapi/setupapi.spec b/dlls/setupapi/setupapi.spec
index 38113e37e22..9733a08e92d 100644
--- a/dlls/setupapi/setupapi.spec
+++ b/dlls/setupapi/setupapi.spec
@@ -249,7 +249,7 @@
 @ stdcall SetupAddToDiskSpaceListA(long str int64 long ptr long)
 @ stdcall SetupAddToDiskSpaceListW(long wstr int64 long ptr long)
 @ stdcall SetupAddToSourceListA(long str)
-@ stub SetupAddToSourceListW
+@ stdcall SetupAddToSourceListW(long wstr)
 @ stub SetupAdjustDiskSpaceListA
 @ stub SetupAdjustDiskSpaceListW
 @ stub SetupCancelTemporarySourceList
diff --git a/dlls/setupapi/stubs.c b/dlls/setupapi/stubs.c
index db05e643405..d6968a64853 100644
--- a/dlls/setupapi/stubs.c
+++ b/dlls/setupapi/stubs.c
@@ -240,6 +240,15 @@ BOOL WINAPI SetupAddToSourceListA(DWORD flags, PCSTR source)
     return TRUE;
 }
 
+/***********************************************************************
+ *      SetupAddToSourceListW (SETUPAPI.@)
+ */
+BOOL WINAPI SetupAddToSourceListW(DWORD flags, PCWSTR source)
+{
+    FIXME("0x%08x %s\n", flags, debugstr_w(source));
+    return TRUE;
+}
+
 /***********************************************************************
  *      SetupSetSourceListA (SETUPAPI.@)
  */