diff --git a/pyproject.toml b/pyproject.toml
index d966316d..3dbe90f2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,3 @@ docs = [
 examples = [
   "notebook",
 ]
-[tool.pytest.ini_options]
- pythonpath = [
-   "src"]
\ No newline at end of file
diff --git a/src/pygccxml/declarations/container_traits.py b/src/pygccxml/declarations/container_traits.py
index b2c4c104..0f8d1d61 100644
--- a/src/pygccxml/declarations/container_traits.py
+++ b/src/pygccxml/declarations/container_traits.py
@@ -19,6 +19,16 @@
 
 std_namespaces = ('std', 'stdext', '__gnu_cxx')
 
+# Take into account different equivalences (with or without spaces)
+string_equivalences = type_traits.string_equivalences + \
+    type_traits.normalized_string_equivalences
+string_equivalences = [
+    v for v in string_equivalences if not v == "std::string"]
+wstring_equivalences = type_traits.wstring_equivalences + \
+    type_traits.normalized_wstring_equivalences
+wstring_equivalences = [
+    v for v in wstring_equivalences if not v == "std::wstring"]
+
 
 class defaults_eraser(object):
 
@@ -29,16 +39,9 @@ def normalize(self, type_str):
         return type_str.replace(' ', '')
 
     def replace_basic_string(self, cls_name):
-        # Replace all the variations of strings by the smallest one.
         strings = {
-            "std::string":
-                [v for v in
-                 type_traits.normalized_string_equivalences
-                 if not v == "std::string"],
-            "std::wstring":
-                [v for v in
-                 type_traits.normalized_wstring_equivalences
-                 if not v == "std::wstring"]
+            "std::string": string_equivalences,
+            "std::wstring": wstring_equivalences
             }
 
         new_name = cls_name
diff --git a/src/pygccxml/declarations/type_traits.py b/src/pygccxml/declarations/type_traits.py
index 49aa6950..ba129259 100644
--- a/src/pygccxml/declarations/type_traits.py
+++ b/src/pygccxml/declarations/type_traits.py
@@ -490,29 +490,33 @@ def _normalize_equivalences(equivalences):
 
 string_equivalences = [
     (
-        '::std::basic_string<char, std::char_traits<char>, '
+        'std::basic_string<char, std::char_traits<char>, '
         'std::allocator<char>>'
     ),
-    '::std::basic_string<char>',
-    '::std::string'
+    'std::basic_string<char>',
+    'std::string'
     ]
 
 wstring_equivalences = [
     (
-        '::std::basic_string<wchar_t, std::char_traits<wchar_t>, '
+        'std::basic_string<wchar_t, std::char_traits<wchar_t>, '
         'std::allocator<wchar_t>>'
     ),
-    '::std::basic_string<wchar_t>',
-    '::std::wstring'
+    'std::basic_string<wchar_t>',
+    'std::wstring'
     ]
 
 ostream_equivalences = [
-    '::std::basic_ostream<char, std::char_traits<char>>',
-    '::std::basic_ostream<char>', '::std::ostream']
+    'std::basic_ostream<char, std::char_traits<char>>',
+    'std::basic_ostream<char>',
+    'std::ostream'
+    ]
 
 wostream_equivalences = [
-    '::std::basic_ostream<wchar_t, std::char_traits<wchar_t>>',
-    '::std::basic_ostream<wchar_t>', '::std::wostream']
+    'std::basic_ostream<wchar_t, std::char_traits<wchar_t>>',
+    'std::basic_ostream<wchar_t>',
+    'std::wostream'
+    ]
 
 
 normalized_string_equivalences = _normalize_equivalences(