diff --git a/Userland/Libraries/LibM/math.cpp b/Userland/Libraries/LibM/math.cpp
index 068dfb7d88..2ccdac6272 100644
--- a/Userland/Libraries/LibM/math.cpp
+++ b/Userland/Libraries/LibM/math.cpp
@@ -303,6 +303,21 @@ static FloatT internal_copysign(FloatT x, FloatT y) NOEXCEPT
 
 extern "C" {
 
+float nanf(const char* s) NOEXCEPT
+{
+    return __builtin_nanf(s);
+}
+
+double nan(const char* s) NOEXCEPT
+{
+    return __builtin_nan(s);
+}
+
+long double nanl(const char* s) NOEXCEPT
+{
+    return __builtin_nanl(s);
+}
+
 double trunc(double x) NOEXCEPT
 {
     return internal_to_integer(x, RoundingMode::ToZero);
diff --git a/Userland/Libraries/LibM/math.h b/Userland/Libraries/LibM/math.h
index 5f769fbc2d..224eb283a9 100644
--- a/Userland/Libraries/LibM/math.h
+++ b/Userland/Libraries/LibM/math.h
@@ -77,6 +77,10 @@ __BEGIN_DECLS
 #define DOUBLE_MAX ((double)0b0111111111101111111111111111111111111111111111111111111111111111)
 #define DOUBLE_MIN ((double)0b0000000000010000000000000000000000000000000000000000000000000000)
 
+long double nanl(const char*) NOEXCEPT;
+double nan(const char*) NOEXCEPT;
+float nanf(const char*) NOEXCEPT;
+
 double acos(double) NOEXCEPT;
 float acosf(float) NOEXCEPT;
 double asin(double) NOEXCEPT;