diff --git a/lib/os/printk.c b/lib/os/printk.c
index 1d47e373e87..4a6399cc03e 100644
--- a/lib/os/printk.c
+++ b/lib/os/printk.c
@@ -22,6 +22,11 @@
 #include <sys/cbprintf.h>
 #include <sys/types.h>
 
+/* Option present only when CONFIG_USERSPACE enabled. */
+#ifndef CONFIG_PRINTK_BUFFER_SIZE
+#define CONFIG_PRINTK_BUFFER_SIZE 0
+#endif
+
 #if defined(CONFIG_PRINTK_SYNC) && \
 	!(defined(CONFIG_LOG_PRINTK) && defined(CONFIG_LOG2))
 static struct k_spinlock lock;
@@ -77,7 +82,6 @@ void *__printk_get_hook(void)
 
 #if defined(CONFIG_PRINTK) && \
 	!(defined(CONFIG_LOG_PRINTK) && defined(CONFIG_LOG2))
-#ifdef CONFIG_USERSPACE
 struct buf_out_context {
 	int count;
 	unsigned int buf_count;
@@ -102,7 +106,6 @@ static int buf_char_out(int c, void *ctx_p)
 
 	return c;
 }
-#endif /* CONFIG_USERSPACE */
 
 struct out_context {
 	int count;
@@ -116,7 +119,6 @@ static int char_out(int c, void *ctx_p)
 	return _char_out(c);
 }
 
-#ifdef CONFIG_USERSPACE
 void vprintk(const char *fmt, va_list ap)
 {
 	if (k_is_user_context()) {
@@ -140,21 +142,6 @@ void vprintk(const char *fmt, va_list ap)
 #endif
 	}
 }
-#else
-void vprintk(const char *fmt, va_list ap)
-{
-	struct out_context ctx = { 0 };
-#ifdef CONFIG_PRINTK_SYNC
-	k_spinlock_key_t key = k_spin_lock(&lock);
-#endif
-
-	cbvprintf(char_out, &ctx, fmt, ap);
-
-#ifdef CONFIG_PRINTK_SYNC
-	k_spin_unlock(&lock, key);
-#endif
-}
-#endif /* CONFIG_USERSPACE */
 
 void z_impl_k_str_out(char *c, size_t n)
 {