diff --git a/tools/regression/usr.bin/pkill/pgrep-G.t b/tools/regression/usr.bin/pkill/pgrep-_g.t
similarity index 100%
rename from tools/regression/usr.bin/pkill/pgrep-G.t
rename to tools/regression/usr.bin/pkill/pgrep-_g.t
diff --git a/tools/regression/usr.bin/pkill/pgrep-S.t b/tools/regression/usr.bin/pkill/pgrep-_s.t
similarity index 100%
rename from tools/regression/usr.bin/pkill/pgrep-S.t
rename to tools/regression/usr.bin/pkill/pgrep-_s.t
diff --git a/tools/regression/usr.bin/pkill/pkill-G.t b/tools/regression/usr.bin/pkill/pkill-_g.t
similarity index 100%
rename from tools/regression/usr.bin/pkill/pkill-G.t
rename to tools/regression/usr.bin/pkill/pkill-_g.t