diff --git a/targets/TARGET_NXP/TARGET_LPC11UXX/TARGET_LPC11U37H_401/PinNames.h b/targets/TARGET_NXP/TARGET_LPC11UXX/TARGET_LPC11U37H_401/PinNames.h
index 56e1f557f4..f1b833936c 100644
--- a/targets/TARGET_NXP/TARGET_LPC11UXX/TARGET_LPC11U37H_401/PinNames.h
+++ b/targets/TARGET_NXP/TARGET_LPC11UXX/TARGET_LPC11U37H_401/PinNames.h
@@ -147,9 +147,13 @@ typedef enum {
     SDMISO = P0_8,
     SDSCLK = P1_29,
     SDSSEL = P1_12,
-    
+
     // Not connected
     NC = (int)0xFFFFFFFF,
+
+    // Standard but not supported pins
+    USBTX = NC,
+    USBRX = NC,
 } PinName;
 
 typedef enum {
diff --git a/targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F405RG/PinNames.h b/targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F405RG/PinNames.h
index daed9f0c4f..7d1e08913b 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F405RG/PinNames.h
+++ b/targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_MDOT_F405RG/PinNames.h
@@ -140,7 +140,12 @@ typedef enum {
     USB_OTG_HS_ULPI_NXT = PC_3,
 
     // Not connected
-    NC = (int)0xFFFFFFFF
+    NC = (int)0xFFFFFFFF,
+
+    // Standard but not supported pins
+    USBTX = NC,
+    USBRX = NC
+
 } PinName;
 
 #ifdef __cplusplus