diff --git a/system/cu/cu_main.c b/system/cu/cu_main.c
index 5311ffc34..2c91d427c 100644
--- a/system/cu/cu_main.c
+++ b/system/cu/cu_main.c
@@ -304,11 +304,11 @@ int main(int argc, FAR char *argv[])
             break;
 
           case 'e':
-            parity = PARITY_ODD;
+            parity = PARITY_EVEN;
             break;
 
           case 'o':
-            parity = PARITY_EVEN;
+            parity = PARITY_ODD;
             break;
 
           case 'r':