diff --git a/include/Nazara/Core/Bitset.hpp b/include/Nazara/Core/Bitset.hpp
index c359181cc..bc1df0e27 100644
--- a/include/Nazara/Core/Bitset.hpp
+++ b/include/Nazara/Core/Bitset.hpp
@@ -63,9 +63,9 @@ class NzBitset
 		void Swap(NzBitset& bitset);
 
 		bool Test(unsigned int bit) const;
-		bool TestAll();
-		bool TestAny();
-		bool TestNone();
+		bool TestAll() const;
+		bool TestAny() const;
+		bool TestNone() const;
 
 		template<typename T> T To() const;
 		NzString ToString() const;
diff --git a/include/Nazara/Core/Bitset.inl b/include/Nazara/Core/Bitset.inl
index bcd0187ff..a02c16550 100644
--- a/include/Nazara/Core/Bitset.inl
+++ b/include/Nazara/Core/Bitset.inl
@@ -309,7 +309,7 @@ bool NzBitset<Block, Allocator>::Test(unsigned int bit) const
 }
 
 template<typename Block, class Allocator>
-bool NzBitset<Block, Allocator>::TestAll()
+bool NzBitset<Block, Allocator>::TestAll() const
 {
 	// Cas particulier du dernier bloc
 	Block lastBlockMask = GetLastBlockMask();
@@ -325,7 +325,7 @@ bool NzBitset<Block, Allocator>::TestAll()
 }
 
 template<typename Block, class Allocator>
-bool NzBitset<Block, Allocator>::TestAny()
+bool NzBitset<Block, Allocator>::TestAny() const
 {
 	if (m_blocks.empty())
 		return false;
@@ -340,7 +340,7 @@ bool NzBitset<Block, Allocator>::TestAny()
 }
 
 template<typename Block, class Allocator>
-bool NzBitset<Block, Allocator>::TestNone()
+bool NzBitset<Block, Allocator>::TestNone() const
 {
 	return !TestAny();
 }