diff --git a/src/if_python3.c b/src/if_python3.c
index cae18c2..477c367 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -156,6 +156,7 @@
 # define PyMapping_Items py3_PyMapping_Items
 # define PyIter_Next py3_PyIter_Next
 # define PyObject_GetIter py3_PyObject_GetIter
+# define PyObject_IsTrue py3_PyObject_IsTrue
 # define PyModule_GetDict py3_PyModule_GetDict
 #undef PyRun_SimpleString
 # define PyRun_SimpleString py3_PyRun_SimpleString
@@ -264,6 +265,7 @@
 static PyObject* (*py3_PyDict_New)(void);
 static PyObject* (*py3_PyIter_Next)(PyObject *);
 static PyObject* (*py3_PyObject_GetIter)(PyObject *);
+static int (*py3_PyObject_IsTrue)(PyObject *);
 static PyObject* (*py3_Py_BuildValue)(char *, ...);
 static int (*py3_PyType_Ready)(PyTypeObject *type);
 static int (*py3_PyDict_SetItemString)(PyObject *dp, char *key, PyObject *item);
@@ -392,6 +394,7 @@
     {"PyMapping_Items", (PYTHON_PROC*)&py3_PyMapping_Items},
     {"PyIter_Next", (PYTHON_PROC*)&py3_PyIter_Next},
     {"PyObject_GetIter", (PYTHON_PROC*)&py3_PyObject_GetIter},
+    {"PyObject_IsTrue", (PYTHON_PROC*)&py3_PyObject_IsTrue},
     {"PyLong_FromLong", (PYTHON_PROC*)&py3_PyLong_FromLong},
     {"PyDict_New", (PYTHON_PROC*)&py3_PyDict_New},
     {"PyType_Ready", (PYTHON_PROC*)&py3_PyType_Ready},