diff --git a/.github/workflows/ci_tests_legacy.yaml b/.github/workflows/ci_tests_legacy.yaml
index c06f37dd18e..8f20ffb379f 100644
--- a/.github/workflows/ci_tests_legacy.yaml
+++ b/.github/workflows/ci_tests_legacy.yaml
@@ -95,7 +95,10 @@ jobs:
           mkdir -p ~/.gmt
           mv .gmt/* ~/.gmt
           # Change modification times of the two files, so GMT won't refresh it
-          touch ~/.gmt/gmt_data_server.txt ~/.gmt/gmt_hash_server.txt
+          # The two files are in the `~/.gmt/server` directory for GMT<=6.4, and
+          # in the `~/.gmt` directory for GMT>=6.5.
+          mv ~/.gmt/gmt_data_server.txt ~/.gmt/gmt_hash_server.txt ~/.gmt/server/
+          touch ~/.gmt/server/gmt_data_server.txt ~/.gmt/server/gmt_hash_server.txt
           ls -lhR ~/.gmt
 
       # Install the package that we want to test