diff --git a/Libraries/LibJS/Bytecode/Builtins.h b/Libraries/LibJS/Bytecode/Builtins.h
index 31c478ba10d..63ee46add08 100644
--- a/Libraries/LibJS/Bytecode/Builtins.h
+++ b/Libraries/LibJS/Bytecode/Builtins.h
@@ -24,7 +24,8 @@ namespace JS::Bytecode {
     O(MathRound, math_round, Math, round, 1)    \
     O(MathSqrt, math_sqrt, Math, sqrt, 1)       \
     O(MathSin, math_sin, Math, sin, 1)          \
-    O(MathCos, math_cos, Math, cos, 1)
+    O(MathCos, math_cos, Math, cos, 1)          \
+    O(MathTan, math_tan, Math, tan, 1)
 
 enum class Builtin : u8 {
 #define DEFINE_BUILTIN_ENUM(name, ...) name,
diff --git a/Libraries/LibJS/Bytecode/Interpreter.cpp b/Libraries/LibJS/Bytecode/Interpreter.cpp
index f6dc83c79d3..a75acb443cc 100644
--- a/Libraries/LibJS/Bytecode/Interpreter.cpp
+++ b/Libraries/LibJS/Bytecode/Interpreter.cpp
@@ -2823,6 +2823,8 @@ static ThrowCompletionOr<Value> dispatch_builtin_call(Bytecode::Interpreter& int
         return TRY(MathObject::sin_impl(interpreter.vm(), interpreter.get(arguments[0])));
     case Builtin::MathCos:
         return TRY(MathObject::cos_impl(interpreter.vm(), interpreter.get(arguments[0])));
+    case Builtin::MathTan:
+        return TRY(MathObject::tan_impl(interpreter.vm(), interpreter.get(arguments[0])));
     case Bytecode::Builtin::__Count:
         VERIFY_NOT_REACHED();
     }
diff --git a/Libraries/LibJS/Runtime/MathObject.cpp b/Libraries/LibJS/Runtime/MathObject.cpp
index 8460dfbc5cc..7417ee369c5 100644
--- a/Libraries/LibJS/Runtime/MathObject.cpp
+++ b/Libraries/LibJS/Runtime/MathObject.cpp
@@ -44,7 +44,7 @@ void MathObject::initialize(Realm& realm)
     define_native_function(realm, vm.names.trunc, trunc, 1, attr);
     define_native_function(realm, vm.names.sin, sin, 1, attr, Bytecode::Builtin::MathSin);
     define_native_function(realm, vm.names.cos, cos, 1, attr, Bytecode::Builtin::MathCos);
-    define_native_function(realm, vm.names.tan, tan, 1, attr);
+    define_native_function(realm, vm.names.tan, tan, 1, attr, Bytecode::Builtin::MathTan);
     define_native_function(realm, vm.names.pow, pow, 2, attr, Bytecode::Builtin::MathPow);
     define_native_function(realm, vm.names.exp, exp, 1, attr, Bytecode::Builtin::MathExp);
     define_native_function(realm, vm.names.expm1, expm1, 1, attr);
@@ -971,10 +971,10 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::sqrt)
 }
 
 // 21.3.2.34 Math.tan ( x ), https://tc39.es/ecma262/#sec-math.tan
-JS_DEFINE_NATIVE_FUNCTION(MathObject::tan)
+ThrowCompletionOr<Value> MathObject::tan_impl(VM& vm, Value value)
 {
     // Let n be ? ToNumber(x).
-    auto number = TRY(vm.argument(0).to_number(vm));
+    auto number = TRY(value.to_number(vm));
 
     // 2. If n is NaN, n is +0𝔽, or n is -0𝔽, return n.
     if (number.is_nan() || number.is_positive_zero() || number.is_negative_zero())
@@ -988,6 +988,11 @@ JS_DEFINE_NATIVE_FUNCTION(MathObject::tan)
     return Value(::tan(number.as_double()));
 }
 
+JS_DEFINE_NATIVE_FUNCTION(MathObject::tan)
+{
+    return tan_impl(vm, vm.argument(0));
+}
+
 // 21.3.2.35 Math.tanh ( x ), https://tc39.es/ecma262/#sec-math.tanh
 JS_DEFINE_NATIVE_FUNCTION(MathObject::tanh)
 {
diff --git a/Libraries/LibJS/Runtime/MathObject.h b/Libraries/LibJS/Runtime/MathObject.h
index 847b0e106da..99e9c52bca4 100644
--- a/Libraries/LibJS/Runtime/MathObject.h
+++ b/Libraries/LibJS/Runtime/MathObject.h
@@ -30,6 +30,7 @@ public:
     static ThrowCompletionOr<Value> imul_impl(VM&, Value, Value);
     static ThrowCompletionOr<Value> sin_impl(VM&, Value);
     static ThrowCompletionOr<Value> cos_impl(VM&, Value);
+    static ThrowCompletionOr<Value> tan_impl(VM&, Value);
 
     static Value random_impl();