diff --git a/src/libsys/libsys.c b/src/libsys/libsys.c
index 2403b70..5edfe0b 100644
--- a/src/libsys/libsys.c
+++ b/src/libsys/libsys.c
@@ -1034,10 +1034,9 @@ int unlink(char *name)
 	return -1;
 }
 
-int sputs(char *pStr)
+int sputs(char const *pStr)
 {
-	char *start;
-	start = pStr;
+	char const *start = pStr;
 
 	while(*pStr)
 		_putchar(GetPort(1), *(pStr++));
diff --git a/src/libsys/libsys.h b/src/libsys/libsys.h
index 9b2cf86..4fe9714 100644
--- a/src/libsys/libsys.h
+++ b/src/libsys/libsys.h
@@ -380,7 +380,7 @@ void DCACHE_invalidate_at(UINT32* pPtr);
 char readchar(UINT32 port);
 void writechar(UINT32 port, char c);
 int write(int file, char *ptr, int len);
-int sputs(char *pStr);
+int sputs(char const *pStr);
 void print_byte(char byte);
 void print_word(int word);
 void _exit (int exitcode);