diff --git a/source/blender/python/api2_2x/euler.c b/source/blender/python/api2_2x/euler.c
index 8816c286943..53489e0f737 100644
--- a/source/blender/python/api2_2x/euler.c
+++ b/source/blender/python/api2_2x/euler.c
@@ -347,6 +347,7 @@ static PyObject *Euler_slice(EulerObject * self, int begin, int end)
 	int count;
 
 	CLAMP(begin, 0, 3);
+	if (end<0) end= 4+end;
 	CLAMP(end, 0, 3);
 	begin = MIN2(begin,end);
 
@@ -368,6 +369,7 @@ static int Euler_ass_slice(EulerObject * self, int begin, int end,
 	PyObject *e, *f;
 
 	CLAMP(begin, 0, 3);
+	if (end<0) end= 4+end;
 	CLAMP(end, 0, 3);
 	begin = MIN2(begin,end);
 
diff --git a/source/blender/python/api2_2x/quat.c b/source/blender/python/api2_2x/quat.c
index 09b7ef5fe3c..3793db47686 100644
--- a/source/blender/python/api2_2x/quat.c
+++ b/source/blender/python/api2_2x/quat.c
@@ -350,6 +350,7 @@ static PyObject *Quaternion_slice(QuaternionObject * self, int begin, int end)
 	int count;
 
 	CLAMP(begin, 0, 4);
+	if (end<0) end= 5+end;
 	CLAMP(end, 0, 4);
 	begin = MIN2(begin,end);
 
@@ -371,6 +372,7 @@ static int Quaternion_ass_slice(QuaternionObject * self, int begin, int end,
 	PyObject *q, *f;
 
 	CLAMP(begin, 0, 4);
+	if (end<0) end= 5+end;
 	CLAMP(end, 0, 4);
 	begin = MIN2(begin,end);
 
diff --git a/source/blender/python/api2_2x/vector.c b/source/blender/python/api2_2x/vector.c
index 64ff035fa1f..2e13122f09f 100644
--- a/source/blender/python/api2_2x/vector.c
+++ b/source/blender/python/api2_2x/vector.c
@@ -359,6 +359,7 @@ static PyObject *Vector_slice(VectorObject * self, int begin, int end)
 	int count;
 
 	CLAMP(begin, 0, self->size);
+	if (end<0) end= self->size+end+1;
 	CLAMP(end, 0, self->size);
 	begin = MIN2(begin,end);
 
@@ -380,6 +381,7 @@ static int Vector_ass_slice(VectorObject * self, int begin, int end,
 	PyObject *v;
 
 	CLAMP(begin, 0, self->size);
+	if (end<0) end= self->size+end+1;
 	CLAMP(end, 0, self->size);
 	begin = MIN2(begin,end);