diff --git a/Userland/Libraries/LibJS/Bytecode/Builtins.h b/Userland/Libraries/LibJS/Bytecode/Builtins.h
index eb647d1cf4..4832579359 100644
--- a/Userland/Libraries/LibJS/Bytecode/Builtins.h
+++ b/Userland/Libraries/LibJS/Bytecode/Builtins.h
@@ -12,10 +12,11 @@
 namespace JS::Bytecode {
 
 // TitleCaseName, snake_case_name, base, property, argument_count
-#define JS_ENUMERATE_BUILTINS(O)       \
-    O(MathAbs, math_abs, Math, abs, 1) \
-    O(MathLog, math_log, Math, log, 1) \
-    O(MathPow, math_pow, Math, pow, 2) \
+#define JS_ENUMERATE_BUILTINS(O)             \
+    O(MathAbs, math_abs, Math, abs, 1)       \
+    O(MathLog, math_log, Math, log, 1)       \
+    O(MathPow, math_pow, Math, pow, 2)       \
+    O(MathFloor, math_floor, Math, floor, 1) \
     O(MathSqrt, math_sqrt, Math, sqrt, 1)
 
 enum class Builtin {
diff --git a/Userland/Libraries/LibJS/JIT/Compiler.cpp b/Userland/Libraries/LibJS/JIT/Compiler.cpp
index 1bc017fab9..7f6136ad5b 100644
--- a/Userland/Libraries/LibJS/JIT/Compiler.cpp
+++ b/Userland/Libraries/LibJS/JIT/Compiler.cpp
@@ -2663,6 +2663,19 @@ void Compiler::compile_builtin_math_pow(Assembler::Label&, Assembler::Label& end
     m_assembler.jump(end);
 }
 
+static Value cxx_math_floor(VM& vm, Value, Value value)
+{
+    return TRY_OR_SET_EXCEPTION(MathObject::floor_impl(vm, value));
+}
+
+void Compiler::compile_builtin_math_floor(Assembler::Label&, Assembler::Label& end)
+{
+    native_call((void*)cxx_math_floor);
+    store_accumulator(RET);
+    check_exception();
+    m_assembler.jump(end);
+}
+
 void Compiler::compile_builtin_math_abs(Assembler::Label& slow_case, Assembler::Label& end)
 {
     branch_if_int32(ARG2, [&] {
diff --git a/Userland/Libraries/LibJS/Runtime/MathObject.cpp b/Userland/Libraries/LibJS/Runtime/MathObject.cpp
index edbcaa0130..31b4dc4f15 100644
--- a/Userland/Libraries/LibJS/Runtime/MathObject.cpp
+++ b/Userland/Libraries/LibJS/Runtime/MathObject.cpp
@@ -32,7 +32,7 @@ void MathObject::initialize(Realm& realm)
     define_native_function(realm, vm.names.abs, abs, 1, attr, Bytecode::Builtin::MathAbs);
     define_native_function(realm, vm.names.random, random, 0, attr);
     define_native_function(realm, vm.names.sqrt, sqrt, 1, attr, Bytecode::Builtin::MathSqrt);
-    define_native_function(realm, vm.names.floor, floor, 1, attr);
+    define_native_function(realm, vm.names.floor, floor, 1, attr, Bytecode::Builtin::MathFloor);
     define_native_function(realm, vm.names.ceil, ceil, 1, attr);
     define_native_function(realm, vm.names.round, round, 1, attr);
     define_native_function(realm, vm.names.max, max, 2, attr);
@@ -456,10 +456,10 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::expm1)
 }
 
 // 21.3.2.16 Math.floor ( x ), https://tc39.es/ecma262/#sec-math.floor
-JS_DEFINE_NATIVE_FUNCTION(MathObject::floor)
+ThrowCompletionOr<Value> MathObject::floor_impl(VM& vm, Value x)
 {
     // 1. Let n be ? ToNumber(x).
-    auto number = TRY(vm.argument(0).to_number(vm));
+    auto number = TRY(x.to_number(vm));
 
     // 2. If n is not finite or n is either +0𝔽 or -0𝔽, return n.
     if (!number.is_finite_number() || number.as_double() == 0)
@@ -471,6 +471,12 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::floor)
     return Value(::floor(number.as_double()));
 }
 
+// 21.3.2.16 Math.floor ( x ), https://tc39.es/ecma262/#sec-math.floor
+JS_DEFINE_NATIVE_FUNCTION(MathObject::floor)
+{
+    return floor_impl(vm, vm.argument(0));
+}
+
 // 21.3.2.17 Math.fround ( x ), https://tc39.es/ecma262/#sec-math.fround
 JS_DEFINE_NATIVE_FUNCTION(MathObject::fround)
 {
diff --git a/Userland/Libraries/LibJS/Runtime/MathObject.h b/Userland/Libraries/LibJS/Runtime/MathObject.h
index aefe843e95..e02ec4e7c8 100644
--- a/Userland/Libraries/LibJS/Runtime/MathObject.h
+++ b/Userland/Libraries/LibJS/Runtime/MathObject.h
@@ -21,6 +21,7 @@ public:
     static ThrowCompletionOr<Value> log_impl(VM&, Value);
     static ThrowCompletionOr<Value> sqrt_impl(VM&, Value);
     static ThrowCompletionOr<Value> pow_impl(VM&, Value base, Value exponent);
+    static ThrowCompletionOr<Value> floor_impl(VM&, Value);
 
 private:
     explicit MathObject(Realm&);