diff --git a/dlls/api-ms-win-crt-locale-l1-1-0/api-ms-win-crt-locale-l1-1-0.spec b/dlls/api-ms-win-crt-locale-l1-1-0/api-ms-win-crt-locale-l1-1-0.spec
index 974980865ad..c7e5aae86db 100644
--- a/dlls/api-ms-win-crt-locale-l1-1-0/api-ms-win-crt-locale-l1-1-0.spec
+++ b/dlls/api-ms-win-crt-locale-l1-1-0/api-ms-win-crt-locale-l1-1-0.spec
@@ -11,9 +11,9 @@
 @ cdecl _free_locale(ptr) ucrtbase._free_locale
 @ cdecl _get_current_locale() ucrtbase._get_current_locale
 @ cdecl _getmbcp() ucrtbase._getmbcp
-@ stub _lock_locales
+@ cdecl _lock_locales() ucrtbase._lock_locales
 @ cdecl _setmbcp(long) ucrtbase._setmbcp
-@ stub _unlock_locales
+@ cdecl _unlock_locales() ucrtbase._unlock_locales
 @ stub _wcreate_locale
 @ cdecl _wsetlocale(long wstr) ucrtbase._wsetlocale
 @ cdecl localeconv() ucrtbase.localeconv
diff --git a/dlls/msvcrt/locale.c b/dlls/msvcrt/locale.c
index eed5a3703b2..74da555cc37 100644
--- a/dlls/msvcrt/locale.c
+++ b/dlls/msvcrt/locale.c
@@ -1591,6 +1591,22 @@ static MSVCRT_pthreadlocinfo create_locinfo(int category,
     return locinfo;
 }
 
+/*********************************************************************
+ *      _lock_locales (UCRTBASE.@)
+ */
+void CDECL _lock_locales(void)
+{
+    LOCK_LOCALE
+}
+
+/*********************************************************************
+ *      _unlock_locales (UCRTBASE.@)
+ */
+void CDECL _unlock_locales(void)
+{
+    UNLOCK_LOCALE
+}
+
 /*********************************************************************
  *      _create_locale (MSVCRT.@)
  */
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index 14ffa6331e0..690072b4145 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -563,7 +563,7 @@
 @ cdecl _localtime64(ptr) MSVCRT__localtime64
 @ cdecl _localtime64_s(ptr ptr)
 @ cdecl _lock_file(ptr) MSVCRT__lock_file
-@ stub _lock_locales
+@ cdecl _lock_locales()
 @ cdecl _locking(long long long) MSVCRT__locking
 @ cdecl _logb(double) MSVCRT__logb
 @ cdecl -arch=arm,x86_64 _logbf(float) MSVCRT__logbf
@@ -2000,7 +2000,7 @@
 @ cdecl _unlink(str) MSVCRT__unlink
 @ cdecl _unloaddll(long)
 @ cdecl _unlock_file(ptr) MSVCRT__unlock_file
-@ stub _unlock_locales
+@ cdecl _unlock_locales()
 @ cdecl _utime32(str ptr)
 @ cdecl _utime64(str ptr)
 @ cdecl _waccess(wstr long) MSVCRT__waccess