diff --git a/src/main/target/MATEKF405SE/target.h b/src/main/target/MATEKF405SE/target.h
index 724a9a2c2d4..efce983f5d4 100644
--- a/src/main/target/MATEKF405SE/target.h
+++ b/src/main/target/MATEKF405SE/target.h
@@ -135,7 +135,11 @@
 #define SOFTSERIAL_1_TX_PIN      PA2
 #define SOFTSERIAL_1_RX_PIN      PA2
 
+#ifdef MATEKF405SE_PINIO
+#define SERIAL_PORT_COUNT       7
+#else
 #define SERIAL_PORT_COUNT       8
+#endif
 
 #define DEFAULT_RX_TYPE         RX_TYPE_SERIAL
 #define SERIALRX_PROVIDER       SERIALRX_SBUS
diff --git a/src/main/target/MATEKF722PX/target.h b/src/main/target/MATEKF722PX/target.h
index ad30f96f08e..ce780e7c93b 100755
--- a/src/main/target/MATEKF722PX/target.h
+++ b/src/main/target/MATEKF722PX/target.h
@@ -125,7 +125,11 @@
 #define SOFTSERIAL_1_TX_PIN      PA2 //TX2 pad
 #define SOFTSERIAL_1_RX_PIN      NONE
 
+#ifdef MATEKF722PX_PINIO
+#define SERIAL_PORT_COUNT       7
+#else
 #define SERIAL_PORT_COUNT       8
+#endif
 
 #define DEFAULT_RX_TYPE         RX_TYPE_SERIAL
 #define SERIALRX_PROVIDER       SERIALRX_SBUS