diff --git a/Misc/NEWS b/Misc/NEWS
index 281ab3ed5f5..82b1081fda7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -57,6 +57,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #18599: Fix name attribute of _sha1.sha1() object. It now returns
+  'SHA1' instead of 'SHA'.
+
 - Issue #18561: Skip name in ctypes' _build_callargs() if name is NULL.
 
 - Issue #18559: Fix NULL pointer dereference error in _pickle module
diff --git a/Modules/sha1module.c b/Modules/sha1module.c
index f824bb3b5ab..d0f318d3fd2 100644
--- a/Modules/sha1module.c
+++ b/Modules/sha1module.c
@@ -415,7 +415,7 @@ SHA1_get_block_size(PyObject *self, void *closure)
 static PyObject *
 SHA1_get_name(PyObject *self, void *closure)
 {
-    return PyUnicode_FromStringAndSize("SHA1", 3);
+    return PyUnicode_FromStringAndSize("SHA1", 4);
 }
 
 static PyObject *