diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index e53e2dd6d530..cd2cf9a6f40b 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -557,7 +557,7 @@ uart4: serial@200 {
 				dma-names = "tx", "rx";
 				atmel,use-dma-rx;
 				atmel,use-dma-tx;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
 				status = "disabled";
 			};
@@ -618,7 +618,7 @@ uart6: serial@200 {
 				clocks = <&pmc PMC_TYPE_PERIPHERAL 40>;
 				clock-names = "usart";
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				status = "disabled";
 			};
 		};
@@ -643,7 +643,7 @@ uart7: serial@200 {
 				dma-names = "tx", "rx";
 				atmel,use-dma-rx;
 				atmel,use-dma-tx;
-				atmel,fifo-size = <16>;
+				atmel,fifo-size = <32>;
 				atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
 				status = "disabled";
 			};