diff --git a/source/heimdal/lib/roken/gai_strerror.c b/source/heimdal/lib/roken/gai_strerror.c
index 5c28f58bf46..8138a594057 100644
--- a/source/heimdal/lib/roken/gai_strerror.c
+++ b/source/heimdal/lib/roken/gai_strerror.c
@@ -40,7 +40,7 @@ RCSID("$Id: gai_strerror.c,v 1.5 2005/04/12 11:28:42 lha Exp $");
 
 static struct gai_error {
     int code;
-    char *str;
+    const char *str;
 } errors[] = {
 {EAI_NOERROR,		"no error"},
 #ifdef EAI_ADDRFAMILY
@@ -65,7 +65,7 @@ static struct gai_error {
  *
  */
 
-char * ROKEN_LIB_FUNCTION
+const char * ROKEN_LIB_FUNCTION
 gai_strerror(int ecode)
 {
     struct gai_error *g;
diff --git a/source/heimdal/lib/roken/roken.h b/source/heimdal/lib/roken/roken.h
index 545f43c6a75..200968729e6 100644
--- a/source/heimdal/lib/roken/roken.h
+++ b/source/heimdal/lib/roken/roken.h
@@ -543,7 +543,7 @@ freeaddrinfo(struct addrinfo *ai);
 #endif
 
 #ifndef HAVE_GAI_STRERROR
-char * ROKEN_LIB_FUNCTION
+const char * ROKEN_LIB_FUNCTION
 gai_strerror(int ecode);
 #endif