diff --git a/var/spack/repos/builtin/packages/apple-clang/package.py b/var/spack/repos/builtin/packages/apple-clang/package.py
index 57ee9e998c0..764418a23d5 100644
--- a/var/spack/repos/builtin/packages/apple-clang/package.py
+++ b/var/spack/repos/builtin/packages/apple-clang/package.py
@@ -57,9 +57,9 @@ def _standard_flag(self, *, language, standard):
             "cxx": {
                 "11": [("@4.0:", "-std=c++11")],
                 "14": [("@6.1:", "-std=c++14")],
-                "17": [("@6.1:10.0", "-std=c++1z"), ("10.1:", "-std=c++17")],
-                "20": [("@10.0:13.0", "-std=c++2a"), ("13.1:", "-std=c++20")],
-                "23": [("13.0:", "-std=c++2b")],
+                "17": [("@6.1:10.0", "-std=c++1z"), ("@10.1:", "-std=c++17")],
+                "20": [("@10.0:13.0", "-std=c++2a"), ("@13.1:", "-std=c++20")],
+                "23": [("@13.0:", "-std=c++2b")],
             },
             "c": {
                 "99": [("@4.0:", "-std=c99")],