diff --git a/Base/Aliases.hpp b/Base/Aliases.hpp
index b648b23..b5f34a1 100644
--- a/Base/Aliases.hpp
+++ b/Base/Aliases.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	typedef std::int8_t sint8;
 	typedef std::int16_t sint16;
 	typedef std::int32_t sint32;
diff --git a/Base/Base.hpp b/Base/Base.hpp
index 20339a9..28c8cd5 100644
--- a/Base/Base.hpp
+++ b/Base/Base.hpp
@@ -7,10 +7,6 @@
 #include <cstdint>
 #include <cstdlib>
 
-#ifndef USER_NAMESPACE
-	#error "ModuleBase: Please define USER_NAMESPACE with a user namespace name."
-#endif
-
 #include "Context.hpp"
 #include "Macros.hpp"
 
diff --git a/Base/Bit.hpp b/Base/Bit.hpp
index 533cff6..5d1b3cb 100644
--- a/Base/Bit.hpp
+++ b/Base/Bit.hpp
@@ -6,7 +6,7 @@
 // Returns a number with a single set bit at `index`.
 #define BIT(index) (1 << (index))
 
-namespace USER_NAMESPACE {
+namespace atl {
 	// Returns the minimum number of bits necessary to store `value`.
 	inline uint8 countBits(uint64 value) {
 		uint8 bitCount = 0;
diff --git a/Base/Cast.hpp b/Base/Cast.hpp
index c42f5e2..8540372 100644
--- a/Base/Cast.hpp
+++ b/Base/Cast.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	template<typename O, typename I>
 	typename std::enable_if<std::is_const<typename std::remove_pointer<O>::type>::value, O>::type pointer_cast(I pointer) {
 		return static_cast<O>(static_cast<const void*>(pointer));
diff --git a/Base/Limits.hpp b/Base/Limits.hpp
index 63ded19..b001ca3 100644
--- a/Base/Limits.hpp
+++ b/Base/Limits.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	// Returns the minimum value representable by `T`.
 	template<typename T>
 	constexpr T min() noexcept;
diff --git a/Base/Types/base_sequence.hpp b/Base/Types/base_sequence.hpp
index f7b415d..ce7ef20 100644
--- a/Base/Types/base_sequence.hpp
+++ b/Base/Types/base_sequence.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	// TODO(upgrade): Allocate from arena.
 	template<typename T>
 	class base_sequence {
diff --git a/Base/Types/base_view.hpp b/Base/Types/base_view.hpp
index 0afdbba..00ec028 100644
--- a/Base/Types/base_view.hpp
+++ b/Base/Types/base_view.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	template<typename T>
 	class base_view {
 		public:
diff --git a/Base/Types/sequence.hpp b/Base/Types/sequence.hpp
index 3d7ea67..95ff8a5 100644
--- a/Base/Types/sequence.hpp
+++ b/Base/Types/sequence.hpp
@@ -6,7 +6,7 @@
 #include "Types/base_sequence.hpp"
 #include "Types/base_view.hpp"
 
-namespace USER_NAMESPACE {
+namespace atl {
 	// A container that encapsulates a dynamic size array.
 	// Unlike `std::vector<T>`, `sequence<T>` is not resizeable.
 	// It *should* be used when the number of elements is known at runtime, before creating the sequence.
diff --git a/Base/Types/view.hpp b/Base/Types/view.hpp
index f3e9734..c45c73c 100644
--- a/Base/Types/view.hpp
+++ b/Base/Types/view.hpp
@@ -5,7 +5,7 @@
 
 #include "Types/base_view.hpp"
 
-namespace USER_NAMESPACE {
+namespace atl {
 	template<typename T>
 	class view : public base_view<T> {
 		public:
diff --git a/Base/Utilities.hpp b/Base/Utilities.hpp
index d24a491..30f5f3e 100644
--- a/Base/Utilities.hpp
+++ b/Base/Utilities.hpp
@@ -3,7 +3,7 @@
 
 #pragma once
 
-namespace USER_NAMESPACE {
+namespace atl {
 	template<typename T>
 	inline void copy(const T* sourceBegin, const T* sourceEnd, T* destination) {
 		std::copy(sourceBegin, sourceEnd, destination);