diff --git a/arch/arm/src/kinetis/hardware/kinetis_k40pinmux.h b/arch/arm/src/kinetis/hardware/kinetis_k40pinmux.h
index ad647509d39..8d274df1df2 100644
--- a/arch/arm/src/kinetis/hardware/kinetis_k40pinmux.h
+++ b/arch/arm/src/kinetis/hardware/kinetis_k40pinmux.h
@@ -351,7 +351,9 @@
 
 #define PIN_LCD_P40              (PIN_ANALOG | PIN_PORTD | PIN0)
 #define PIN_SPI0_PCS0_3          (PIN_ALT2   | PIN_PORTD | PIN0)
-#define PIN_UART2_RTS            (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS          (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_LCD_P40F             (PIN_ALT7   | PIN_PORTD | PIN0)
 #define PIN_LCD_P41              (PIN_ANALOG | PIN_PORTD | PIN1)
 #define PIN_ADC0_SE5B            (PIN_ANALOG | PIN_PORTD | PIN1)
diff --git a/arch/arm/src/kinetis/hardware/kinetis_k60pinmux.h b/arch/arm/src/kinetis/hardware/kinetis_k60pinmux.h
index f2afdbe118a..8b2f7381596 100644
--- a/arch/arm/src/kinetis/hardware/kinetis_k60pinmux.h
+++ b/arch/arm/src/kinetis/hardware/kinetis_k60pinmux.h
@@ -346,7 +346,9 @@
 #define PIN_FB_TA                (PIN_ALT6   | PIN_PORTC | PIN19)
 
 #define PIN_SPI0_PCS0_3          (PIN_ALT2   | PIN_PORTD | PIN0)
-#define PIN_UART2_RTS            (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS          (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_FTM3_CH0_2           (PIN_ALT4   | PIN_PORTD | PIN0)
 #define PIN_FB_ALE               (PIN_ALT5   | PIN_PORTD | PIN0)
 #define PIN_FB_CS1               (PIN_ALT5   | PIN_PORTD | PIN0)
diff --git a/arch/arm/src/kinetis/hardware/kinetis_k64pinmux.h b/arch/arm/src/kinetis/hardware/kinetis_k64pinmux.h
index dd71e6a5cef..76a93c5b875 100644
--- a/arch/arm/src/kinetis/hardware/kinetis_k64pinmux.h
+++ b/arch/arm/src/kinetis/hardware/kinetis_k64pinmux.h
@@ -563,7 +563,9 @@
 #define PIN_UART1_TX_2            (PIN_ALT3   | PIN_PORTE | PIN0)
 
 #define PIN_UART2_CTS             (PIN_ALT3   | PIN_PORTD | PIN1)
-#define PIN_UART2_RTS             (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS           (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_UART2_RX              (PIN_ALT3   | PIN_PORTD | PIN2)
 #define PIN_UART2_TX              (PIN_ALT3   | PIN_PORTD | PIN3)
 
diff --git a/arch/arm/src/kinetis/hardware/kinetis_k66pinmux.h b/arch/arm/src/kinetis/hardware/kinetis_k66pinmux.h
index ab9960f4e94..089e8563081 100644
--- a/arch/arm/src/kinetis/hardware/kinetis_k66pinmux.h
+++ b/arch/arm/src/kinetis/hardware/kinetis_k66pinmux.h
@@ -678,7 +678,9 @@
 #define PIN_UART1_TX_2            (PIN_ALT3   | PIN_PORTE | PIN0)
 
 #define PIN_UART2_CTS             (PIN_ALT3   | PIN_PORTD | PIN1)
-#define PIN_UART2_RTS             (PIN_ALT3   | PIN_PORTD | PIN0)
+#if !defined(PIN_UART2_RTS)
+#  define PIN_UART2_RTS           (PIN_ALT3   | PIN_PORTD | PIN0)
+#endif
 #define PIN_UART2_RX              (PIN_ALT3   | PIN_PORTD | PIN2)
 #define PIN_UART2_TX              (PIN_ALT3   | PIN_PORTD | PIN3)