diff --git a/src/main/main.c b/src/main/main.c
index 06e2be9ee5..15d2b6cbab 100644
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -247,9 +247,12 @@ void init(void)
 
     dmaInit();
 
-#ifdef AVOID_UART2_FOR_PWM_PPM
+#if defined(AVOID_UART2_FOR_PWM_PPM)
     serialInit(&masterConfig.serialConfig, feature(FEATURE_SOFTSERIAL),
             feature(FEATURE_RX_PPM) || feature(FEATURE_RX_PARALLEL_PWM) ? SERIAL_PORT_USART2 : SERIAL_PORT_NONE);
+#elif defined(AVOID_UART3_FOR_PWM_PPM)
+    serialInit(&masterConfig.serialConfig, feature(FEATURE_SOFTSERIAL),
+            feature(FEATURE_RX_PPM) || feature(FEATURE_RX_PARALLEL_PWM) ? SERIAL_PORT_USART3 : SERIAL_PORT_NONE);
 #else
     serialInit(&masterConfig.serialConfig, feature(FEATURE_SOFTSERIAL), SERIAL_PORT_NONE);
 #endif
diff --git a/src/main/target/ALIENFLIGHTF3/target.h b/src/main/target/ALIENFLIGHTF3/target.h
index 8ce5876683..ce9704fdf3 100644
--- a/src/main/target/ALIENFLIGHTF3/target.h
+++ b/src/main/target/ALIENFLIGHTF3/target.h
@@ -72,6 +72,7 @@
 #define USE_UART2 // Receiver - RX (PA3)
 #define USE_UART3 // Not connected - 10/RX (PB11) 11/TX (PB10)
 #define SERIAL_PORT_COUNT       4
+#define AVOID_UART3_FOR_PWM_PPM
 
 #define UART1_TX_PIN            PB6
 #define UART1_RX_PIN            PB7
diff --git a/src/main/target/SPARKY/target.h b/src/main/target/SPARKY/target.h
index ab498ff5ac..9dbce83c11 100644
--- a/src/main/target/SPARKY/target.h
+++ b/src/main/target/SPARKY/target.h
@@ -56,6 +56,7 @@
 #define USE_UART2 // Input - RX (PA3)
 #define USE_UART3 // Servo out - 10/RX (PB11) 11/TX (PB10)
 #define SERIAL_PORT_COUNT       4
+#define AVOID_UART3_FOR_PWM_PPM
 
 #define UART1_TX_PIN            PB6
 #define UART1_RX_PIN            PB7