diff --git a/sphinx/domains/cpp.py b/sphinx/domains/cpp.py
index b7ecc1651..7dd1d0c03 100644
--- a/sphinx/domains/cpp.py
+++ b/sphinx/domains/cpp.py
@@ -7017,8 +7017,7 @@ class DefinitionParser(BaseParser):
             declaration = self._parse_type_with_init(named=True, outer='member')
         elif objectType == 'function':
             declaration = self._parse_type(named=True, outer='function')
-            if templatePrefix is not None:
-                trailingRequiresClause = self._parse_requires_clause()
+            trailingRequiresClause = self._parse_requires_clause()
         elif objectType == 'class':
             declaration = self._parse_class()
         elif objectType == 'union':
diff --git a/tests/test_domain_cpp.py b/tests/test_domain_cpp.py
index 97b887b9a..9159b1851 100644
--- a/tests/test_domain_cpp.py
+++ b/tests/test_domain_cpp.py
@@ -891,6 +891,8 @@ def test_domain_cpp_ast_requires_clauses():
           {4: 'I0EIQaa1A1BE1fvv'})
     check('function', 'template<typename T> requires A || B or C void f()',
           {4: 'I0EIQoo1Aoo1B1CE1fvv'})
+    check('function', 'void f() requires A || B || C',
+          {4: 'IQoo1Aoo1B1CE1fv'})
     check('function', 'template<typename T> requires A && B || C and D void f()',
           {4: 'I0EIQooaa1A1Baa1C1DE1fvv'})
     check('function',