diff --git a/include/ki/util/BitTypes.h b/include/ki/util/BitTypes.h
index cec212c..048a86d 100644
--- a/include/ki/util/BitTypes.h
+++ b/include/ki/util/BitTypes.h
@@ -75,7 +75,7 @@ namespace ki
 			m_value = 0;
 		}
 
-		BitInteger(BitInteger<N, Unsigned> &cp)
+		BitInteger(const BitInteger<N, Unsigned> &cp)
 		{
 			m_value = cp.m_value;
 		}
diff --git a/src/pclass/TypeSystem.cpp b/src/pclass/TypeSystem.cpp
index 1e1aaaa..066e74b 100644
--- a/src/pclass/TypeSystem.cpp
+++ b/src/pclass/TypeSystem.cpp
@@ -7,6 +7,16 @@
 	define_primitive<st>("signed " n); \
 	define_primitive<ut>("unsigned " n)
 
+#define DEFINE_BI_PRIMITIVE(n) \
+	define_primitive< bi<n> >("bi" #n)
+
+#define DEFINE_BUI_PRIMITIVE(n) \
+	define_primitive< bui<n> >("bui" #n)
+
+#define DEFINE_BIT_INTEGER_PRIMITIVE(n) \
+	DEFINE_BI_PRIMITIVE(n); \
+	DEFINE_BUI_PRIMITIVE(n)
+
 namespace ki
 {
 namespace pclass
@@ -44,6 +54,17 @@ namespace pclass
 		define_primitive<uint64_t>("uint64_t");
 		define_primitive<uint64_t>("gid");
 
+		// Define bit-integer types
+		DEFINE_BIT_INTEGER_PRIMITIVE(1);
+		DEFINE_BIT_INTEGER_PRIMITIVE(2);
+		DEFINE_BIT_INTEGER_PRIMITIVE(3);
+		DEFINE_BIT_INTEGER_PRIMITIVE(4);
+		DEFINE_BIT_INTEGER_PRIMITIVE(5);
+		DEFINE_BIT_INTEGER_PRIMITIVE(6);
+		DEFINE_BIT_INTEGER_PRIMITIVE(7);
+		define_primitive<bi<24>>("s24");
+		define_primitive<bui<24>>("u24");
+
 		// TODO: Define bit integer types
 		// TODO: Define floating point types
 		// TODO: Define bit floating point types