diff --git a/ttmath/ttmathuint_x86.h b/ttmath/ttmathuint_x86.h
index 69da94f..d5bb4a3 100644
--- a/ttmath/ttmathuint_x86.h
+++ b/ttmath/ttmathuint_x86.h
@@ -75,7 +75,7 @@ namespace ttmath
 		function returns carry (1) (if it has been)
 	*/
 	template<uint value_size>
-	uint UInt<value_size>::Add(const UInt<value_size> & ss2, uint c=0)
+	uint UInt<value_size>::Add(const UInt<value_size> & ss2, uint c)
 	{
 	register uint b = value_size;
 	register uint * p1 = table;
@@ -189,7 +189,7 @@ namespace ttmath
 		of course if there was a carry from table[2] it would be returned
 	*/
 	template<uint value_size>
-	uint UInt<value_size>::AddInt(uint value, uint index = 0)
+	uint UInt<value_size>::AddInt(uint value, uint index)
 	{
 	register uint b = value_size;
 	register uint * p1 = table;
@@ -410,7 +410,7 @@ namespace ttmath
 		function returns carry (1) (if it has been)
 	*/
 	template<uint value_size>
-	uint UInt<value_size>::Sub(const UInt<value_size> & ss2, uint c=0)
+	uint UInt<value_size>::Sub(const UInt<value_size> & ss2, uint c)
 	{
 	register uint b = value_size;
 	register uint * p1 = table;
@@ -518,7 +518,7 @@ namespace ttmath
 		of course if there was a carry from table[3] it would be returned
 	*/
 	template<uint value_size>
-	uint UInt<value_size>::SubInt(uint value, uint index = 0)
+	uint UInt<value_size>::SubInt(uint value, uint index)
 	{
 	register uint b = value_size;
 	register uint * p1 = table;
diff --git a/ttmath/ttmathuint_x86_64.h b/ttmath/ttmathuint_x86_64.h
index a211596..4ddf437 100644
--- a/ttmath/ttmathuint_x86_64.h
+++ b/ttmath/ttmathuint_x86_64.h
@@ -77,7 +77,7 @@ namespace ttmath
 	{
 	uint b = value_size;
 	uint * p1 = table;
-	const uint * p2 = const_cast<uint*>(ss2.table);
+	const uint * p2 = ss2.table;
 	uint dummy, dummy2;
 
 		// we don't have to use TTMATH_REFERENCE_ASSERT here