diff --git a/src/if_python3.c b/src/if_python3.c
index 8acab9d..02da1b0 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -336,6 +336,7 @@
 static PyObject *p3imp_PyExc_KeyboardInterrupt;
 static PyObject *p3imp_PyExc_TypeError;
 static PyObject *p3imp_PyExc_ValueError;
+static PyObject *p3imp_PyExc_RuntimeError;
 
 # define PyExc_AttributeError p3imp_PyExc_AttributeError
 # define PyExc_IndexError p3imp_PyExc_IndexError
@@ -343,6 +344,7 @@
 # define PyExc_KeyboardInterrupt p3imp_PyExc_KeyboardInterrupt
 # define PyExc_TypeError p3imp_PyExc_TypeError
 # define PyExc_ValueError p3imp_PyExc_ValueError
+# define PyExc_RuntimeError p3imp_PyExc_RuntimeError
 
 /*
  * Table of name to function pointer of python.
@@ -580,12 +582,14 @@
     p3imp_PyExc_KeyboardInterrupt = PyDict_GetItemString(exdict, "KeyboardInterrupt");
     p3imp_PyExc_TypeError = PyDict_GetItemString(exdict, "TypeError");
     p3imp_PyExc_ValueError = PyDict_GetItemString(exdict, "ValueError");
+    p3imp_PyExc_RuntimeError = PyDict_GetItemString(exdict, "RuntimeError");
     Py_XINCREF(p3imp_PyExc_AttributeError);
     Py_XINCREF(p3imp_PyExc_IndexError);
     Py_XINCREF(p3imp_PyExc_KeyError);
     Py_XINCREF(p3imp_PyExc_KeyboardInterrupt);
     Py_XINCREF(p3imp_PyExc_TypeError);
     Py_XINCREF(p3imp_PyExc_ValueError);
+    Py_XINCREF(p3imp_PyExc_RuntimeError);
     Py_XDECREF(exmod);
 }
 #endif /* DYNAMIC_PYTHON3 */
@@ -1132,7 +1136,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return NULL;
     }
 }
@@ -1166,7 +1170,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return -1;
     }
 }
@@ -1248,7 +1252,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return NULL;
     }
 }
@@ -1275,7 +1279,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return -1;
     }
 }
@@ -1450,7 +1454,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return NULL;
     }
 }
@@ -1474,7 +1478,7 @@
     }
     else
     {
-	PyErr_SetString(PyExc_IndexError, "Index must be int or slice");
+	PyErr_SetString(PyExc_TypeError, _("index must be int or slice"));
 	return -1;
     }
 }