diff --git a/CMakeLists.txt b/CMakeLists.txt
index f612e80..3397989 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -59,6 +59,13 @@ enable_testing()
               )
              set_tests_properties(test_horus_binary PROPERTIES PASS_REGULAR_EXPRESSION "1C9A9545")
 
+     add_test(NAME test_horus_rtty_7n1
+             COMMAND sh -c "cd ${CMAKE_CURRENT_BINARY_DIR}/src;
+                            sox ${CMAKE_CURRENT_SOURCE_DIR}/samples/rtty_7n1.wav -r 48000 -t raw - |
+                            ./horus_demod -c -m rtty7n1 - - | grep OK | wc -l"
+              )
+             set_tests_properties(test_horus_rtty_7n1 PROPERTIES PASS_REGULAR_EXPRESSION "3")
+
      add_test(NAME test_horus_rtty_7n2
              COMMAND sh -c "cd ${CMAKE_CURRENT_BINARY_DIR}/src;
                             sox ${CMAKE_CURRENT_SOURCE_DIR}/samples/rtty_7n2.wav -r 48000 -t raw - |
diff --git a/samples/rtty_7n1.wav b/samples/rtty_7n1.wav
new file mode 100644
index 0000000..5121f4a
Binary files /dev/null and b/samples/rtty_7n1.wav differ