diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 76618ea3690..87cae041a42 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1469,7 +1469,7 @@
 @ stub fread_s
 @ cdecl free(ptr) msvcrt.free
 @ cdecl freopen(str str ptr) msvcrt.freopen
-@ stub freopen_s
+@ cdecl freopen_s(ptr str str ptr) msvcrt.freopen_s
 @ cdecl frexp(double ptr) msvcrt.frexp
 @ varargs fscanf(ptr str) msvcrt.fscanf
 @ varargs fscanf_s(ptr str) msvcrt.fscanf_s
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index f3c0a946b65..06751ef5fa7 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -1325,7 +1325,7 @@
 @ stub fread_s
 @ cdecl free(ptr) msvcrt.free
 @ cdecl freopen(str str ptr) msvcrt.freopen
-@ stub freopen_s
+@ cdecl freopen_s(ptr str str ptr) msvcrt.freopen_s
 @ cdecl frexp(double ptr) msvcrt.frexp
 @ varargs fscanf(ptr str) msvcrt.fscanf
 @ varargs fscanf_s(ptr str) msvcrt.fscanf_s
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index e40d2e9024a..688bdc628cc 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -1326,7 +1326,7 @@
 @ stub fread_s
 @ cdecl free(ptr) msvcrt.free
 @ cdecl freopen(str str ptr) msvcrt.freopen
-@ stub freopen_s
+@ cdecl freopen_s(ptr str str ptr) msvcrt.freopen_s
 @ cdecl frexp(double ptr) msvcrt.frexp
 @ varargs fscanf(ptr str) msvcrt.fscanf
 @ varargs fscanf_s(ptr str) msvcrt.fscanf_s
diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index b6af98fb335..f3200eba194 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -3299,6 +3299,25 @@ MSVCRT_FILE* CDECL MSVCRT_freopen(const char *path, const char *mode, MSVCRT_FIL
     return ret;
 }
 
+/*********************************************************************
+ *      freopen_s (MSVCRT.@)
+ */
+int CDECL MSVCRT_freopen_s(MSVCRT_FILE** pFile,
+        const char *path, const char *mode, MSVCRT_FILE* file)
+{
+    if (!MSVCRT_CHECK_PMT(pFile != NULL) || !MSVCRT_CHECK_PMT(path != NULL) ||
+        !MSVCRT_CHECK_PMT(mode != NULL) || !MSVCRT_CHECK_PMT(file != NULL)) {
+        *MSVCRT__errno() = MSVCRT_EINVAL;
+        return MSVCRT_EINVAL;
+    }
+
+    *pFile = MSVCRT_freopen(path, mode, file);
+
+    if(!*pFile)
+        return *MSVCRT__errno();
+    return 0;
+}
+
 /*********************************************************************
  *		fsetpos (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index c8c710deb48..f2b5e330b47 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -1269,7 +1269,7 @@
 @ cdecl fread(ptr long long ptr) MSVCRT_fread
 @ cdecl free(ptr) MSVCRT_free
 @ cdecl freopen(str str ptr) MSVCRT_freopen
-# stub freopen_s(ptr str str ptr)
+@ cdecl freopen_s(ptr str str ptr) MSVCRT_freopen_s
 @ cdecl frexp(double ptr) MSVCRT_frexp
 @ cdecl -arch=x86_64 frexpf(float ptr) MSVCRT_frexpf
 @ varargs fscanf(ptr str) MSVCRT_fscanf