diff --git a/AUTHORS b/AUTHORS
index cb73916bc..1eeb3869a 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -376,6 +376,7 @@ Tomer Keren
 Tony Narlock
 Tor Colvin
 Trevor Bekolay
+Tushar Sadhwani
 Tyler Goodlet
 Tyler Smart
 Tzu-ping Chung
diff --git a/changelog/11140.bugfix.rst b/changelog/11140.bugfix.rst
new file mode 100644
index 000000000..cdf0b37c7
--- /dev/null
+++ b/changelog/11140.bugfix.rst
@@ -0,0 +1 @@
+Fix non-string constants at the top of file being detected as docstrings on Python>=3.8.
diff --git a/src/_pytest/assertion/rewrite.py b/src/_pytest/assertion/rewrite.py
index fd2355297..d1974bb3b 100644
--- a/src/_pytest/assertion/rewrite.py
+++ b/src/_pytest/assertion/rewrite.py
@@ -604,6 +604,13 @@ def _get_assertion_exprs(src: bytes) -> Dict[int, str]:
     return ret
 
 
+def _get_ast_constant_value(value: astStr) -> object:
+    if sys.version_info >= (3, 8):
+        return value.value
+    else:
+        return value.s
+
+
 class AssertionRewriter(ast.NodeVisitor):
     """Assertion rewriting implementation.
 
@@ -700,11 +707,10 @@ class AssertionRewriter(ast.NodeVisitor):
                 expect_docstring
                 and isinstance(item, ast.Expr)
                 and isinstance(item.value, astStr)
+                and isinstance(_get_ast_constant_value(item.value), str)
             ):
-                if sys.version_info >= (3, 8):
-                    doc = item.value.value
-                else:
-                    doc = item.value.s
+                doc = _get_ast_constant_value(item.value)
+                assert isinstance(doc, str)
                 if self.is_rewrite_disabled(doc):
                     return
                 expect_docstring = False
diff --git a/testing/test_assertrewrite.py b/testing/test_assertrewrite.py
index fbf285495..2f59ace54 100644
--- a/testing/test_assertrewrite.py
+++ b/testing/test_assertrewrite.py
@@ -2077,3 +2077,17 @@ class TestReprSizeVerbosity:
         self.create_test_file(pytester, DEFAULT_REPR_MAX_SIZE * 10)
         result = pytester.runpytest("-vv")
         result.stdout.no_fnmatch_line("*xxx...xxx*")
+
+
+class TestIssue11140:
+    def test_constant_not_picked_as_module_docstring(self, pytester: Pytester) -> None:
+        pytester.makepyfile(
+            """\
+            0
+
+            def test_foo():
+                pass
+            """
+        )
+        result = pytester.runpytest()
+        assert result.ret == 0