diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 24ed8bf..03547f3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-latest, ubuntu-latest, windows-latest ]
+        os: [ macos-13, ubuntu-latest, windows-latest ]
         dc: [ dmd-latest, ldc-latest ]
     name: ${{ matrix.os }}, ${{ matrix.dc }}
     runs-on: ${{ matrix.os }}
diff --git a/rdmd_test.d b/rdmd_test.d
index 8815698..626f510 100755
--- a/rdmd_test.d
+++ b/rdmd_test.d
@@ -140,12 +140,12 @@ void runCompilerAgnosticTests(string rdmdApp, string defaultCompiler, string mod
     /* Test help string output when no arguments passed. */
     auto res = execute([rdmdApp]);
     enforce(res.status == 1, res.output);
-    enforce(res.output.canFind("Usage: rdmd [RDMD AND DMD OPTIONS]... program [PROGRAM OPTIONS]..."));
+    enforce(res.output.canFind("Usage: rdmd [RDMD AND DMD OPTIONS...] program [PROGRAM OPTIONS...]"));
 
     /* Test --help. */
     res = execute([rdmdApp, "--help"]);
     enforce(res.status == 0, res.output);
-    enforce(res.output.canFind("Usage: rdmd [RDMD AND DMD OPTIONS]... program [PROGRAM OPTIONS]..."));
+    enforce(res.output.canFind("Usage: rdmd [RDMD AND DMD OPTIONS...] program [PROGRAM OPTIONS...]"));
 
     string helpText = res.output;