diff --git a/kernel/unified/Kconfig b/kernel/unified/Kconfig
index ff803fab6d3..80a3dc694fb 100644
--- a/kernel/unified/Kconfig
+++ b/kernel/unified/Kconfig
@@ -114,6 +114,16 @@ config MAIN_STACK_SIZE
 
 	After initialization is complete, the thread runs main().
 
+config IDLE_STACK_SIZE
+	int
+	prompt "Size of stack for idle thread"
+	default 256
+	help
+	Depending on the work that the idle task must do, most likely due to
+	power management but possibly to other features like system event
+	logging (e.g. logging when the system goes to sleep), the idle thread
+	may need more stack space than the default value.
+
 config ISR_STACK_SIZE
 	int
 	prompt "ISR and initialization stack size (in bytes)"
diff --git a/kernel/unified/init.c b/kernel/unified/init.c
index a825d8f2374..7425b839c45 100644
--- a/kernel/unified/init.c
+++ b/kernel/unified/init.c
@@ -72,7 +72,7 @@ uint64_t __noinit __idle_tsc;  /* timestamp when CPU goes idle */
 
 /* init/main and idle threads */
 
-#define IDLE_STACK_SIZE 256
+#define IDLE_STACK_SIZE CONFIG_IDLE_STACK_SIZE
 
 #if CONFIG_MAIN_STACK_SIZE & (STACK_ALIGN - 1)
     #error "MAIN_STACK_SIZE must be a multiple of the stack alignment"