diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index c1eb5949eb0..d4e9b350fae 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1026,7 +1026,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index c0bc9e1c6b9..ef01e7750ac 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1373,7 +1373,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 0faf1f03dda..c439652e812 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1377,7 +1377,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcr120_app/msvcr120_app.spec b/dlls/msvcr120_app/msvcr120_app.spec
index eddb27d48f3..3d572670f3e 100644
--- a/dlls/msvcr120_app/msvcr120_app.spec
+++ b/dlls/msvcr120_app/msvcr120_app.spec
@@ -1244,7 +1244,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) msvcr120._iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) msvcr120._isxdigit_l
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 13a22701894..aafc05c0471 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -699,7 +699,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index e53f622fb31..da5d325a093 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -676,7 +676,7 @@
 @ stub _iswlower_l
 @ stub _iswprint_l
 @ stub _iswpunct_l
-@ stub _iswspace_l
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 @ stub _iswupper_l
 @ stub _iswxdigit_l
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 7156a5035fb..4788dec2eec 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -642,7 +642,7 @@
 # stub _iswlower_l(long ptr)
 # stub _iswprint_l(long ptr)
 # stub _iswpunct_l(long ptr)
-# stub _iswspace_l(long ptr)
+@ cdecl _iswspace_l(long ptr) MSVCRT__iswspace_l
 # stub _iswupper_l(long ptr)
 # stub _iswxdigit_l(long ptr)
 @ cdecl _isxdigit_l(long ptr) MSVCRT__isxdigit_l
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 771f6f6f319..f4fd8a8bce6 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -1595,6 +1595,14 @@ INT CDECL MSVCRT_iswpunct( MSVCRT_wchar_t wc )
     return ispunctW( wc );
 }
 
+/*********************************************************************
+ *		_iswspace_l (MSVCRT.@)
+ */
+INT CDECL MSVCRT__iswspace_l( MSVCRT_wchar_t wc, MSVCRT__locale_t locale )
+{
+    return isspaceW( wc );
+}
+
 /*********************************************************************
  *		iswspace (MSVCRT.@)
  */