diff --git a/src/main/drivers/serial_uart_stm32f30x.c b/src/main/drivers/serial_uart_stm32f30x.c
index c05980ec6..0fa6bed3a 100644
--- a/src/main/drivers/serial_uart_stm32f30x.c
+++ b/src/main/drivers/serial_uart_stm32f30x.c
@@ -213,9 +213,9 @@ void serialUARTInitIO(IO_t txIO, IO_t rxIO, portMode_e mode, portOptions_e optio
     if ((options & SERIAL_BIDIR) && txIO) {
         ioConfig_t ioCfg = IO_CONFIG(GPIO_Mode_AF, GPIO_Speed_50MHz,
             ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_OType_PP : GPIO_OType_OD,
-            ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_PuPd_DOWN : GPIO_PuPd_UP
+            (options & SERIAL_INVERTED) ? GPIO_PuPd_DOWN : GPIO_PuPd_UP
         );
-
+ 
         IOInit(txIO, OWNER_SERIAL_TX, RESOURCE_INDEX(index));
         IOConfigGPIOAF(txIO, ioCfg, af);
 
diff --git a/src/main/drivers/serial_uart_stm32f7xx.c b/src/main/drivers/serial_uart_stm32f7xx.c
index a87a44d3a..28e6addd7 100644
--- a/src/main/drivers/serial_uart_stm32f7xx.c
+++ b/src/main/drivers/serial_uart_stm32f7xx.c
@@ -362,7 +362,7 @@ uartPort_t *serialUART(UARTDevice_e device, uint32_t baudRate, portMode_e mode,
         ioConfig_t ioCfg = IO_CONFIG(
             ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_MODE_AF_PP : GPIO_MODE_AF_OD,
             GPIO_SPEED_FREQ_HIGH,
-            ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_PULLDOWN : GPIO_PULLUP
+            (options & SERIAL_INVERTED) ? GPIO_PULLDOWN : GPIO_PULLUP
         );
 
         IOInit(txIO, OWNER_SERIAL_TX, RESOURCE_INDEX(device));
diff --git a/src/main/drivers/serial_uart_stm32g4xx.c b/src/main/drivers/serial_uart_stm32g4xx.c
index 19186042b..591139303 100644
--- a/src/main/drivers/serial_uart_stm32g4xx.c
+++ b/src/main/drivers/serial_uart_stm32g4xx.c
@@ -297,7 +297,7 @@ uartPort_t *serialUART(UARTDevice_e device, uint32_t baudRate, portMode_e mode,
         ioConfig_t ioCfg = IO_CONFIG(
             ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_MODE_AF_PP : GPIO_MODE_AF_OD,
             GPIO_SPEED_FREQ_HIGH,
-            ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_PULLDOWN : GPIO_PULLUP
+            (options & SERIAL_INVERTED) ? GPIO_PULLDOWN : GPIO_PULLUP
         );
 
         IOInit(txIO, OWNER_SERIAL_TX, RESOURCE_INDEX(device));
diff --git a/src/main/drivers/serial_uart_stm32h7xx.c b/src/main/drivers/serial_uart_stm32h7xx.c
index 672a233c5..b4363eebf 100644
--- a/src/main/drivers/serial_uart_stm32h7xx.c
+++ b/src/main/drivers/serial_uart_stm32h7xx.c
@@ -407,7 +407,7 @@ uartPort_t *serialUART(UARTDevice_e device, uint32_t baudRate, portMode_e mode,
         ioConfig_t ioCfg = IO_CONFIG(
             ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_MODE_AF_PP : GPIO_MODE_AF_OD,
             GPIO_SPEED_FREQ_HIGH,
-            ((options & SERIAL_INVERTED) || (options & SERIAL_BIDIR_PP)) ? GPIO_PULLDOWN : GPIO_PULLUP
+            (options & SERIAL_INVERTED) ? GPIO_PULLDOWN : GPIO_PULLUP
         );
 
         IOInit(txIO, OWNER_SERIAL_TX, RESOURCE_INDEX(device));