diff --git a/llpython/bytetype.py b/llpython/bytetype.py
index 26c1734..3c85f93 100644
--- a/llpython/bytetype.py
+++ b/llpython/bytetype.py
@@ -49,6 +49,14 @@ PyNumber_Multiply = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
 PyNumber_Remainder = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
 PyNumber_Subtract = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
 PyNumber_TrueDivide = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceAdd = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceDivide = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceMultiply = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceRemainder = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceSubtract = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p))
+PyNumber_InPlaceTrueDivide = lc.Type.function(l_pyobj_p, (l_pyobj_p,
+                                                          l_pyobj_p))
+PyObject_IsTrue = lc.Type.function(lc_int, [l_pyobj_p])
 PyObject_RichCompare = lc.Type.function(l_pyobj_p, (l_pyobj_p, l_pyobj_p,
                                                     lc_int))
 PySequence_Contains = lc.Type.function(lc_int, (l_pyobj_p, l_pyobj_p))