diff --git a/build/irix_CC.mak b/build/irix_CC.mak
index 5894ff51..0436ef8a 100644
--- a/build/irix_CC.mak
+++ b/build/irix_CC.mak
@@ -24,7 +24,7 @@ PYINC=-I/usr/local/Python-1.5.2/include/python1.5
 STLPORTINC=-I$(BOOST)/boost/compatibility/cpp_c_headers
 
 STDOPTS=
-WARNOPTS=-woff 1001,1234,1682
+WARNOPTS=-woff 1001,1183,1234,1682
 OPTOPTS=-g
 
 CPP=CC -LANG:std -n32 -mips4
diff --git a/example/simple_vector.cpp b/example/simple_vector.cpp
index 5ac0767b..8f30121b 100644
--- a/example/simple_vector.cpp
+++ b/example/simple_vector.cpp
@@ -30,16 +30,24 @@ namespace { // Avoid cluttering the global namespace.
     }
   };
 
+  void raise_vector_IndexError() {
+    PyErr_SetString(PyExc_IndexError, "IndexError: vector index out of range");
+    throw python::error_already_set();
+  }
+
   double getitem(const std::vector<double>& vd, std::size_t key) {
+    if (key < 0 || key >= vd.size()) raise_vector_IndexError();
     return vd[key];
   }
 
   void setitem(std::vector<double>& vd, std::size_t key, double d) {
+    if (key < 0 || key >= vd.size()) raise_vector_IndexError();
     std::vector<double>::iterator vditer = vd.begin();
     vditer[key] = d;
   }
 
   void delitem(std::vector<double>& vd, std::size_t key) {
+    if (key < 0 || key >= vd.size()) raise_vector_IndexError();
     std::vector<double>::iterator vditer = vd.begin();
     vd.erase(&vditer[key]);
   }
diff --git a/example/test_simple_vector.py b/example/test_simple_vector.py
index a19e205b..ca38d715 100644
--- a/example/test_simple_vector.py
+++ b/example/test_simple_vector.py
@@ -15,6 +15,11 @@ r'''>>> import simple_vector
     >>> v[1] = 40
     >>> print v.as_tuple()
     (3.0, 40.0, 5.0)
+    >>> for e in v:
+    ...   print e
+    3.0
+    40.0
+    5.0
     >>> del v[1]
     >>> print v.as_tuple()
     (3.0, 5.0)