diff --git a/modules/segger/Kconfig b/modules/segger/Kconfig
index 665e3ff716c..1324df8cb81 100644
--- a/modules/segger/Kconfig
+++ b/modules/segger/Kconfig
@@ -38,6 +38,7 @@ config SEGGER_RTT_BUFFER_SIZE_UP
 
 config SEGGER_RTT_BUFFER_SIZE_DOWN
 	int "Size of the buffer for terminal input of target, from host"
+	default 32 if SHELL_BACKEND_RTT
 	default 16
 
 config SEGGER_RTT_PRINTF_BUFFER_SIZE
diff --git a/subsys/logging/backends/Kconfig.uart b/subsys/logging/backends/Kconfig.uart
index 43b544ab66a..8c75df0ff47 100644
--- a/subsys/logging/backends/Kconfig.uart
+++ b/subsys/logging/backends/Kconfig.uart
@@ -4,7 +4,7 @@
 config LOG_BACKEND_UART
 	bool "UART backend"
 	depends on UART_CONSOLE
-	default y if !SHELL_BACKEND_SERIAL
+	default y if !SHELL_BACKEND_SERIAL && !SHELL_BACKEND_RTT
 	select LOG_OUTPUT
 	help
 	  When enabled backend is using UART to output logs.
diff --git a/subsys/shell/Kconfig b/subsys/shell/Kconfig
index d155622e7bb..342608a76a0 100644
--- a/subsys/shell/Kconfig
+++ b/subsys/shell/Kconfig
@@ -90,7 +90,7 @@ config SHELL_ARGC_MAX
 
 config SHELL_TAB
 	bool "The Tab button support in shell"
-	default y if !SHELL_MINIMAL
+	default y if !SHELL_MINIMAL && !SHELL_BACKEND_RTT
 	help
 	  Enable using the Tab button in the shell. The button
 	  can be used for prompting commands, or for autocompletion.
@@ -125,7 +125,7 @@ config SHELL_START_OBSCURED
 
 config SHELL_VT100_COMMANDS
 	bool "VT100 commands in shell"
-	default y
+	default y if !SHELL_BACKEND_RTT
 	help
 	  Enables VT100 commands in shell (e.g. cursor position, clear screen etc.).
 
diff --git a/subsys/shell/backends/Kconfig.backends b/subsys/shell/backends/Kconfig.backends
index af5291545ef..0423d57d0b3 100644
--- a/subsys/shell/backends/Kconfig.backends
+++ b/subsys/shell/backends/Kconfig.backends
@@ -16,6 +16,8 @@ DT_CHOSEN_Z_SHELL_UART := zephyr,shell-uart
 
 config SHELL_BACKEND_SERIAL
 	bool "Serial backend"
+	# Serial (UART) requires interrupts and the RTT backend cannot be used from an ISR context.
+	default n if SHELL_BACKEND_RTT
 	default "$(dt_chosen_enabled,$(DT_CHOSEN_Z_SHELL_UART))" if HAS_DTS
 	default y if !HAS_DTS
 	select SERIAL