diff --git a/colourvalgrind/colourvalgrind.py b/colourvalgrind/colourvalgrind.py
index 9a14a4a..d1013f5 100644
--- a/colourvalgrind/colourvalgrind.py
+++ b/colourvalgrind/colourvalgrind.py
@@ -131,7 +131,7 @@ def func_signature(self, func):
 r"  (?P<_TYPE_LIST_>        (?&_TYPE_) (?: \s* , \s* (?&_TYPE_))* )"
 r"  (?P<_FUNC_PTR_>         (?: (?&_TYPE_) \s* \( (?: (?&_TYPE_) | \* ) \) \s*"
 r"                           \( (?&_TYPE_LIST_)? \) ) )"
-r"  (?P<_PARAM_>            (?: (?&_TYPE_) | (?&_FUNC_PTR_) ) )"
+r"  (?P<_PARAM_>            (?: (?: (?&_TYPE_) (?: \s* \(\) )? ) | (?&_FUNC_PTR_) ) )"
 r"  (?P<_PARAM_LIST_>       (?&_PARAM_) (?: \s* , \s* (?&_PARAM_) )* )"
 r"  (?P<_NUMERIC_LITERAL_>  (?:"
 r"                           (?:"