diff --git a/utils/path.c b/utils/path.c
index 70573260..10eecd84 100644
--- a/utils/path.c
+++ b/utils/path.c
@@ -162,12 +162,13 @@ PaAppend(char **pathptr, const char *newstring)
 
 int
 PaExpand(psource, pdest, size)
-    char **psource;		/* Pointer to a pointer to the source string */
+    const char **psource;	/* Pointer to a pointer to the source string */
     char **pdest;		/* Pointer to a ptr to dest string area. */
     int size;			/* Number of bytes available at pdest */
 
 {
-    char *ps, *pd;
+    const char *ps;
+    char *pd;
     struct passwd *passwd, *getpwnam();
     char expandName[512], *string, *newEntry;
     HashEntry *h;
diff --git a/utils/utils.h b/utils/utils.h
index a74c75c0..7d07e293 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -46,7 +46,7 @@ extern int LookupAny(char, const char * const *);
 extern int LookupFull(const char *, const char * const *);
 extern int LookupStruct(const char *str, const LookupTable *table_start, int size);
 extern int LookupStructFull(const char *str, const char * const *table, int size);
-extern int PaExpand(char **, char **, int);
+extern int PaExpand(const char **, char **, int);
 extern char *nextName();
 extern FILE *PaOpen(char *, char *, char *, char *, char *, char **);
 extern FILE *PaLockOpen(char *, char *, char *, char *, char *, char **, bool *, int *);