3 files changed, 5 insertions, 5 deletions
diff --git a/ext/SDBM_File/sdbm/hash.c b/ext/SDBM_File/sdbm/hash.c
index 9b27648599..7dd1c99e35 100644
--- a/ext/SDBM_File/sdbm/hash.c
+++ b/ext/SDBM_File/sdbm/hash.c
@@ -18,7 +18,7 @@
  *      65587   even better. 
  */
 long
-sdbm_hash(register char *str, register int len)
+sdbm_hash(register const char *str, register int len)
 {
 	register unsigned long n = 0;
 
diff --git a/ext/SDBM_File/sdbm/pair.c b/ext/SDBM_File/sdbm/pair.c
index 4f0fde2302..42b130db19 100644
--- a/ext/SDBM_File/sdbm/pair.c
+++ b/ext/SDBM_File/sdbm/pair.c
@@ -22,7 +22,7 @@
 /* 
  * forward 
  */
-static int seepair proto((char *, int, char *, int));
+static int seepair proto((char *, int, const char *, int));
 
 /*
  * page format:
@@ -218,7 +218,7 @@ delpair(char *pag, datum key)
  * return 0 if not found.
  */
 static int
-seepair(char *pag, register int n, register char *key, register int siz)
+seepair(char *pag, register int n, register const char *key, register int siz)
 {
 	register int i;
 	register int off = PBLKSIZ;
diff --git a/ext/SDBM_File/sdbm/sdbm.h b/ext/SDBM_File/sdbm/sdbm.h
index 88e4b66b39..53fc366801 100644
--- a/ext/SDBM_File/sdbm/sdbm.h
+++ b/ext/SDBM_File/sdbm/sdbm.h
@@ -47,7 +47,7 @@ typedef struct {
 #define sdbm_pagfno(db)	((db)->pagf)
 
 typedef struct {
-	char *dptr;
+	const char *dptr;
 	int dsize;
 } datum;
 
@@ -85,7 +85,7 @@ extern int sdbm_exists proto((DBM *, datum));
  * other
  */
 extern DBM *sdbm_prep proto((char *, char *, int, int));
-extern long sdbm_hash proto((char *, int));
+extern long sdbm_hash proto((const char *, int));
 
 #ifndef SDBM_ONLY
 #define dbm_open sdbm_open