diff --git a/dlls/msvcp60/msvcp60.spec b/dlls/msvcp60/msvcp60.spec
index 307af74eaad..26dbbe7d006 100644
--- a/dlls/msvcp60/msvcp60.spec
+++ b/dlls/msvcp60/msvcp60.spec
@@ -4309,11 +4309,11 @@
 # extern _Xbig
 @ stub __Wcrtomb_lk
 @ cdecl btowc(long) msvcrt.btowc
-@ stub mbrlen # msvcrt.mbrlen
-@ stub mbrtowc # msvcrt.mbrtowc
-@ stub mbsrtowcs # msvcrt.mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen # msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc # msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs # msvcrt.mbsrtowcs
 @ cdecl towctrans(long long)
-@ stub wcrtomb # msvcrt.wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb # msvcrt.wcrtomb
 @ cdecl wcsrtombs(ptr ptr long ptr) msvcrt.wcsrtombs
 @ cdecl wctob(long) msvcrt.wctob
 @ cdecl wctrans(str)
diff --git a/dlls/msvcp70/msvcp70.spec b/dlls/msvcp70/msvcp70.spec
index ce079c2cf7d..c3856fb39dc 100644
--- a/dlls/msvcp70/msvcp70.spec
+++ b/dlls/msvcp70/msvcp70.spec
@@ -5098,11 +5098,11 @@
 # extern _Zero
 @ stub __Wcrtomb_lk
 @ cdecl btowc(long) msvcrt.btowc
-@ stub mbrlen
-@ stub mbrtowc
-@ stub mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs
 @ cdecl towctrans(long long) msvcp90.towctrans
-@ stub wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb
 @ cdecl wcsrtombs(ptr ptr long ptr) msvcrt.wcsrtombs
 @ cdecl wctob(long) msvcrt.wctob
 @ cdecl wctrans(str) msvcp90.wctrans
diff --git a/dlls/msvcp71/msvcp71.spec b/dlls/msvcp71/msvcp71.spec
index 58636c2e8af..70e659f4e2b 100644
--- a/dlls/msvcp71/msvcp71.spec
+++ b/dlls/msvcp71/msvcp71.spec
@@ -5158,11 +5158,11 @@
 # extern _Zero
 @ stub __Wcrtomb_lk
 @ cdecl btowc(long) msvcrt.btowc
-@ stub mbrlen
-@ stub mbrtowc
-@ stub mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs
 @ cdecl towctrans(long long)
-@ stub wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb
 @ cdecl wcsrtombs(ptr ptr long ptr) msvcrt.wcsrtombs
 @ cdecl wctob(long) msvcrt.wctob
 @ cdecl wctrans(str)
diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 8e2a9f4a4c8..b970fb93f6b 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1731,9 +1731,9 @@
 @ cdecl -arch=i386,x86_64 longjmp(ptr long) msvcrt.longjmp
 @ cdecl malloc(long) msvcrt.malloc
 @ cdecl mblen(ptr long) msvcrt.mblen
-@ stub mbrlen
-@ stub mbrtowc
-@ stub mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs
 @ stub mbsrtowcs_s
 @ cdecl mbstowcs(ptr str long) msvcrt.mbstowcs
 @ cdecl mbstowcs_s(ptr ptr long str long) msvcrt.mbstowcs_s
@@ -1841,7 +1841,7 @@
 @ cdecl vswprintf_s(ptr long wstr ptr) msvcrt.vswprintf_s
 @ cdecl vwprintf(wstr ptr) msvcrt.vwprintf
 @ cdecl vwprintf_s(wstr ptr) msvcrt.vwprintf_s
-@ stub wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb
 @ stub wcrtomb_s
 @ cdecl wcscat(wstr wstr) msvcrt.wcscat
 @ cdecl wcscat_s(wstr long wstr) msvcrt.wcscat_s
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 36443451d7b..c6341c4427b 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -1381,9 +1381,9 @@
 @ cdecl -arch=i386,x86_64 longjmp(ptr long) msvcrt.longjmp
 @ cdecl malloc(long) msvcrt.malloc
 @ cdecl mblen(ptr long) msvcrt.mblen
-@ stub mbrlen
-@ stub mbrtowc
-@ stub mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs
 @ stub mbsrtowcs_s
 @ cdecl mbstowcs(ptr str long) msvcrt.mbstowcs
 @ cdecl mbstowcs_s(ptr ptr long str long) msvcrt.mbstowcs_s
@@ -1483,7 +1483,7 @@
 @ cdecl vswprintf_s(ptr long wstr ptr) msvcrt.vswprintf_s
 @ cdecl vwprintf(wstr ptr) msvcrt.vwprintf
 @ cdecl vwprintf_s(wstr ptr) msvcrt.vwprintf_s
-@ stub wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb
 @ stub wcrtomb_s
 @ cdecl wcscat(wstr wstr) msvcrt.wcscat
 @ cdecl wcscat_s(wstr long wstr) msvcrt.wcscat_s
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index e0cb400dd59..3545dd1ba3e 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -1384,9 +1384,9 @@
 @ cdecl -arch=i386,x86_64 longjmp(ptr long) msvcrt.longjmp
 @ cdecl malloc(long) msvcrt.malloc
 @ cdecl mblen(ptr long) msvcrt.mblen
-@ stub mbrlen
-@ stub mbrtowc
-@ stub mbsrtowcs
+@ cdecl mbrlen(ptr long ptr) msvcrt.mbrlen
+@ cdecl mbrtowc(ptr str long ptr) msvcrt.mbrtowc
+@ cdecl mbsrtowcs(ptr ptr long ptr) msvcrt.mbsrtowcs
 @ stub mbsrtowcs_s
 @ cdecl mbstowcs(ptr str long) msvcrt.mbstowcs
 @ cdecl mbstowcs_s(ptr ptr long str long) msvcrt.mbstowcs_s
@@ -1494,7 +1494,7 @@
 @ cdecl vswprintf_s(ptr long wstr ptr) msvcrt.vswprintf_s
 @ cdecl vwprintf(wstr ptr) msvcrt.vwprintf
 @ cdecl vwprintf_s(wstr ptr) msvcrt.vwprintf_s
-@ stub wcrtomb
+@ cdecl wcrtomb(ptr long ptr) msvcrt.wcrtomb
 @ stub wcrtomb_s
 @ cdecl wcscat(wstr wstr) msvcrt.wcscat
 @ cdecl wcscat_s(wstr long wstr) msvcrt.wcscat_s