diff --git a/programs/reg/tests/copy.c b/programs/reg/tests/copy.c
index 31223a3d314..0d245dae4da 100644
--- a/programs/reg/tests/copy.c
+++ b/programs/reg/tests/copy.c
@@ -88,11 +88,38 @@ static void test_command_syntax(void)
     run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC, &r);
     ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
 
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC, &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC "\\", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC "\\", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
     run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC " /f", &r);
     ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
 
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC " /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC "\\ /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC "\\ /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
     run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC " /s /f", &r);
     ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC " /s /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC " HKCU\\" COPY_SRC "\\ /s /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
+
+    run_reg_exe("reg copy HKCU\\" COPY_SRC "\\ HKCU\\" COPY_SRC "\\ /s /f", &r);
+    ok(r == REG_EXIT_FAILURE, "got exit code %d, expected 1\n", r);
 }
 
 START_TEST(copy)