diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
index 42cdb4cd61..1445aea761 100644
--- a/Userland/Libraries/LibC/wchar.cpp
+++ b/Userland/Libraries/LibC/wchar.cpp
@@ -435,4 +435,10 @@ float wcstof(const wchar_t*, wchar_t**)
     dbgln("TODO: Implement wcstof()");
     TODO();
 }
+
+double wcstod(const wchar_t*, wchar_t**)
+{
+    dbgln("TODO: Implement wcstod()");
+    TODO();
+}
 }
diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
index 41441c419c..2e4a769be0 100644
--- a/Userland/Libraries/LibC/wchar.h
+++ b/Userland/Libraries/LibC/wchar.h
@@ -50,5 +50,6 @@ wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);
 unsigned long wcstoul(const wchar_t*, wchar_t**, int);
 unsigned long long wcstoull(const wchar_t*, wchar_t**, int);
 float wcstof(const wchar_t*, wchar_t**);
+double wcstod(const wchar_t*, wchar_t**);
 
 __END_DECLS