diff --git a/include/kernel.h b/include/kernel.h
index 700797e..6dd9e82 100644
--- a/include/kernel.h
+++ b/include/kernel.h
@@ -1,9 +1,11 @@
 #ifndef RIVOS_KERNEL_H
 #define RIVOS_KERNEL_H
 
-typedef struct sbiret_s {
+typedef struct sbiret {
 	long error;
 	long value;
 } sbiret_s;
 
+void kputchar(char ch);
+
 #endif