diff --git a/common/usbx_host_classes/inc/ux_host_class_cdc_acm.h b/common/usbx_host_classes/inc/ux_host_class_cdc_acm.h
index 24b8fb4e..b8c392f4 100644
--- a/common/usbx_host_classes/inc/ux_host_class_cdc_acm.h
+++ b/common/usbx_host_classes/inc/ux_host_class_cdc_acm.h
@@ -135,10 +135,21 @@ extern   "C" {
 
 /* Define CDC ACM default values.  */
 
+#ifndef UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_RATE
 #define UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_RATE          9600
+#endif
+
+#ifndef UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_STOP_BIT
 #define UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_STOP_BIT      0
+#endif
+
+#ifndef UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_PARITY
 #define UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_PARITY        0
+#endif
+
+#ifndef UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_DATA_BIT
 #define UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_DATA_BIT      8
+#endif
 
 /* Define CDC ACM line coding definitions.  */
 
diff --git a/common/usbx_host_classes/inc/ux_host_class_gser.h b/common/usbx_host_classes/inc/ux_host_class_gser.h
index 9332dbfe..8096ff41 100644
--- a/common/usbx_host_classes/inc/ux_host_class_gser.h
+++ b/common/usbx_host_classes/inc/ux_host_class_gser.h
@@ -115,8 +115,21 @@ extern   "C" {
 
 /* Define CDC ACM default values.  */
 
+#ifndef UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_RATE
 #define UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_RATE             9600
+#endif
+
+#ifndef UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_STOP_BIT
+#define UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_STOP_BIT         0
+#endif
+
+#ifndef UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_PARITY
+#define UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_PARITY           0
+#endif
+
+#ifndef UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_DATA_BIT
 #define UX_HOST_CLASS_GSER_LINE_CODING_DEFAULT_DATA_BIT         8
+#endif
 
 /* Define CDC ACM line coding definitions.  */
 
diff --git a/common/usbx_host_classes/inc/ux_host_class_prolific.h b/common/usbx_host_classes/inc/ux_host_class_prolific.h
index 94b516ff..eb6c9cbe 100644
--- a/common/usbx_host_classes/inc/ux_host_class_prolific.h
+++ b/common/usbx_host_classes/inc/ux_host_class_prolific.h
@@ -144,8 +144,21 @@ extern   "C" {
 
 /* Define  PROLIFIC default values.  */
 
+#ifndef UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_RATE
 #define UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_RATE         19200
+#endif
+
+#ifndef UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_STOP_BIT
+#define UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_STOP_BIT     0
+#endif
+
+#ifndef UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_PARITY
+#define UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_PARITY       0
+#endif
+
+#ifndef UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_DATA_BIT
 #define UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_DATA_BIT     8
+#endif
 
 /* Define  PROLIFIC line coding definitions.  */
 
diff --git a/common/usbx_host_classes/src/ux_host_class_prolific_activate.c b/common/usbx_host_classes/src/ux_host_class_prolific_activate.c
index e2afb35f..862af1e8 100644
--- a/common/usbx_host_classes/src/ux_host_class_prolific_activate.c
+++ b/common/usbx_host_classes/src/ux_host_class_prolific_activate.c
@@ -125,8 +125,8 @@ UINT                                status;
     if (status == UX_SUCCESS)
     {
         line_coding.ux_host_class_prolific_line_coding_dter      = UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_RATE;
-        line_coding.ux_host_class_prolific_line_coding_stop_bit  = UX_HOST_CLASS_PROLIFIC_LINE_CODING_STOP_BIT_0;
-        line_coding.ux_host_class_prolific_line_coding_parity    = UX_HOST_CLASS_PROLIFIC_LINE_CODING_PARITY_NONE;
+        line_coding.ux_host_class_prolific_line_coding_stop_bit  = UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_STOP_BIT;
+        line_coding.ux_host_class_prolific_line_coding_parity    = UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_PARITY;
         line_coding.ux_host_class_prolific_line_coding_data_bits = UX_HOST_CLASS_PROLIFIC_LINE_CODING_DEFAULT_DATA_BIT;
         status = _ux_host_class_prolific_ioctl(prolific, UX_HOST_CLASS_PROLIFIC_IOCTL_SET_LINE_CODING, (VOID *) &line_coding);
     }