diff --git a/info/filesys.c b/info/filesys.c
index 52b624178..4f4564486 100644
--- a/info/filesys.c
+++ b/info/filesys.c
@@ -539,7 +539,7 @@ char *
 filesys_error_string (char *filename, int error_num)
 {
   int len;
-  char *result;
+  const char *result;
 
   if (error_num == 0)
     return NULL;
diff --git a/install-info/install-info.c b/install-info/install-info.c
index 21f4fe3e5..45feb1d8f 100644
--- a/install-info/install-info.c
+++ b/install-info/install-info.c
@@ -632,7 +632,7 @@ ensure_dirfile_exists (char *dirfile)
   if (desc < 0 && errno == ENOENT)
     {
       FILE *f;
-      char *readerr = strerror (errno);
+      const char *readerr = strerror (errno);
       f = fopen (dirfile, "w");
       if (f)
         {