diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index d606ebb444c..bbaeda062de 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -30,6 +30,7 @@
 #include <locale.h>
 #include <errno.h>
 #include <limits.h>
+#include <math.h>
 
 static char *buf_to_string(const unsigned char *bin, int len, int nr)
 {
@@ -89,6 +90,7 @@ static size_t (__cdecl *p_wcrtomb)(char*, wchar_t, mbstate_t*);
 static int (__cdecl *p_tolower)(int);
 static size_t (__cdecl *p_mbrlen)(const char*, size_t, mbstate_t*);
 static size_t (__cdecl *p_mbrtowc)(wchar_t*, const char*, size_t, mbstate_t*);
+static int (__cdecl *p__atodbl_l)(_CRT_DOUBLE*,char*,_locale_t);
 
 #define SETNOFAIL(x,y) x = (void*)GetProcAddress(hMsvcrt,y)
 #define SET(x,y) SETNOFAIL(x,y); ok(x != NULL, "Export '%s' not found\n", y)
@@ -2376,6 +2378,66 @@ static void test_tolower(void)
     setlocale(LC_ALL, "C");
 }
 
+static void test__atodbl(void)
+{
+    _CRT_DOUBLE d;
+    char num[32];
+    int ret;
+
+    if(!p__atodbl_l) {
+        /* Old versions of msvcrt use different values for _OVERFLOW and _UNDERFLOW
+         * Because of this lets skip _atodbl tests when _atodbl_l is not available */
+        win_skip("_atodbl_l is not available\n");
+        return;
+    }
+
+    num[0] = 0;
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == 0, "_atodbl_l(&d, \"\", NULL) returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+    ret = _atodbl(&d, num);
+    ok(ret == 0, "_atodbl(&d, \"\") returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+
+    strcpy(num, "t");
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == 0, "_atodbl_l(&d, \"t\", NULL) returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+    ret = _atodbl(&d, num);
+    ok(ret == 0, "_atodbl(&d, \"t\") returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+
+    strcpy(num, "0");
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == 0, "_atodbl_l(&d, \"0\", NULL) returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+    ret = _atodbl(&d, num);
+    ok(ret == 0, "_atodbl(&d, \"0\") returned %d, expected 0\n", ret);
+    ok(d.x == 0, "d.x = %lf, expected 0\n", d.x);
+
+    strcpy(num, "123");
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == 0, "_atodbl_l(&d, \"123\", NULL) returned %d, expected 0\n", ret);
+    ok(d.x == 123, "d.x = %lf, expected 123\n", d.x);
+    ret = _atodbl(&d, num);
+    ok(ret == 0, "_atodbl(&d, \"123\") returned %d, expected 0\n", ret);
+    ok(d.x == 123, "d.x = %lf, expected 123\n", d.x);
+
+    strcpy(num, "1e-309");
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == _UNDERFLOW, "_atodbl_l(&d, \"1e-309\", NULL) returned %d, expected _UNDERFLOW\n", ret);
+    ok(d.x!=0 && almost_equal(d.x, 0), "d.x = %le, expected 0\n", d.x);
+    ret = _atodbl(&d, num);
+    ok(ret == _UNDERFLOW, "_atodbl(&d, \"1e-309\") returned %d, expected _UNDERFLOW\n", ret);
+    ok(d.x!=0 && almost_equal(d.x, 0), "d.x = %le, expected 0\n", d.x);
+
+    strcpy(num, "1e309");
+    ret = p__atodbl_l(&d, num, NULL);
+    ok(ret == _OVERFLOW, "_atodbl_l(&d, \"1e309\", NULL) returned %d, expected _OVERFLOW\n", ret);
+    ret = _atodbl(&d, num);
+    ok(ret == _OVERFLOW, "_atodbl(&d, \"1e309\") returned %d, expected _OVERFLOW\n", ret);
+}
+
 START_TEST(string)
 {
     char mem[100];
@@ -2420,6 +2482,7 @@ START_TEST(string)
     p_mbrlen = (void*)GetProcAddress(hMsvcrt, "mbrlen");
     p_mbrtowc = (void*)GetProcAddress(hMsvcrt, "mbrtowc");
     p_mbsrtowcs = (void*)GetProcAddress(hMsvcrt, "mbsrtowcs");
+    p__atodbl_l = (void*)GetProcAddress(hMsvcrt, "_atodbl_l");
 
     /* MSVCRT memcpy behaves like memmove for overlapping moves,
        MFC42 CString::Insert seems to rely on that behaviour */
@@ -2469,4 +2532,5 @@ START_TEST(string)
     test_wctob();
     test_wctomb();
     test_tolower();
+    test__atodbl();
 }
diff --git a/include/msvcrt/stdlib.h b/include/msvcrt/stdlib.h
index 5010949b119..d4755f4b773 100644
--- a/include/msvcrt/stdlib.h
+++ b/include/msvcrt/stdlib.h
@@ -140,6 +140,7 @@ typedef int (__cdecl *_onexit_t)(void);
 
 
 int           __cdecl _atodbl(_CRT_DOUBLE*,char*);
+int           __cdecl _atodbl_l(_CRT_DOUBLE*,char*,_locale_t);
 int           __cdecl _atoflt(_CRT_FLOAT*,char*);
 int           __cdecl _atoflt_l(_CRT_FLOAT*,char*,_locale_t);
 __int64       __cdecl _atoi64(const char*);