diff --git a/nuttx-configs/px4fmu-v1/nsh/defconfig b/nuttx-configs/px4fmu-v1/nsh/defconfig
index 2c9a21f212..874615d3b2 100644
--- a/nuttx-configs/px4fmu-v1/nsh/defconfig
+++ b/nuttx-configs/px4fmu-v1/nsh/defconfig
@@ -260,6 +260,8 @@ CONFIG_STM32_USART=y
 #
 # U[S]ART Configuration
 #
+# Hot fix for lost data
+CONFIG_STM32_RXDMA_BUFFER_SIZE_OVERRIDE=64
 # CONFIG_USART1_RS485 is not set
 # CONFIG_USART1_RXDMA is not set
 # CONFIG_USART2_RS485 is not set