diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
index b26b2d1c13..aff52acd84 100644
--- a/Userland/Libraries/LibC/wchar.cpp
+++ b/Userland/Libraries/LibC/wchar.cpp
@@ -447,4 +447,10 @@ long double wcstold(const wchar_t*, wchar_t**)
     dbgln("TODO: Implement wcstold()");
     TODO();
 }
+
+int swprintf(wchar_t*, size_t, const wchar_t*, ...)
+{
+    dbgln("TODO: Implement swprintf()");
+    TODO();
+}
 }
diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
index fd92663f80..557217b454 100644
--- a/Userland/Libraries/LibC/wchar.h
+++ b/Userland/Libraries/LibC/wchar.h
@@ -52,5 +52,6 @@ unsigned long long wcstoull(const wchar_t*, wchar_t**, int);
 float wcstof(const wchar_t*, wchar_t**);
 double wcstod(const wchar_t*, wchar_t**);
 long double wcstold(const wchar_t*, wchar_t**);
+int swprintf(wchar_t*, size_t, const wchar_t*, ...);
 
 __END_DECLS