diff --git a/libc/libc.csv b/libc/libc.csv
index 9e3c76b28f..5282519c8a 100644
--- a/libc/libc.csv
+++ b/libc/libc.csv
@@ -202,6 +202,7 @@
 "wcsftime","wchar.h","defined(CONFIG_LIBC_WCHAR)","size_t","FAR wchar_t *","size_t","FAR const wchar_t *","FAR const struct tm *"
 "wcslcpy","wchar.h","defined(CONFIG_LIBC_WCHAR)","size_t","FAR const wchar_t *","FAR const wchar_t *","size_t"
 "wcslen","wchar.h","defined(CONFIG_LIBC_WCHAR)","size_t","FAR const wchar_t *"
+"wcstod","wchar.h","defined(CONFIG_LIBC_WCHAR)","","FAR const wchar_t *","FAR wchar_t **"
 "wcstof","wchar.h","defined(CONFIG_LIBC_WCHAR)","float","FAR const wchar_t *","FAR wchar_t **"
 "wcstol","wchar.h","defined(CONFIG_LIBC_WCHAR)","long int","FAR const wchar_t *","FAR wchar_t **","int"
 "wcstold","wchar.h","defined(CONFIG_LIBC_WCHAR)","long double","FAR const wchar_t *","FAR wchar_t **"
diff --git a/libc/wchar/Make.defs b/libc/wchar/Make.defs
index 680ab5504c..c45807574a 100644
--- a/libc/wchar/Make.defs
+++ b/libc/wchar/Make.defs
@@ -42,6 +42,7 @@ CSRCS += lib_wmemcpy.c lib_wmemmove.c lib_wmemset.c lib_btowc.c
 CSRCS += lib_mbrtowc.c lib_wctob.c lib_wcslcpy.c lib_wcsxfrm.c
 CSRCS += lib_wcrtomb.c lib_wcsftime.c lib_wcscoll.c lib_wcstol.c
 CSRCS += lib_wcstoll.c lib_wcstoul.c lib_wcstold.c lib_wcstof.c
+CSRCS += lib_wcstod.c
 
 # Add the wchar directory to the build
 
diff --git a/libc/wchar/lib_wcstod.c b/libc/wchar/lib_wcstod.c
new file mode 100644
index 0000000000..18982a9ccf
--- /dev/null
+++ b/libc/wchar/lib_wcstod.c
@@ -0,0 +1,60 @@
+/****************************************************************************
+ * libc/wchar/lib_wcstod.c
+ *
+ *   Copyright (c)1999 Citrus Project,
+ *   All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdlib.h>
+#include <wchar.h>
+
+#ifdef CONFIG_LIBC_WCHAR
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: wcstod
+ *
+ * Description:
+ *   The wcstod() function is the wide-character equivalent of the strtod()
+ *   function. It converts a wchar string to long long value.
+ *
+ ****************************************************************************/
+
+double wcstod(FAR const wchar_t *nptr, FAR wchar_t **endptr)
+{
+  return strtod((FAR const char *)nptr, (FAR char **)endptr);
+}
+
+#endif /* CONFIG_LIBC_WCHAR */