diff --git a/servers/slapd/overlays/overlays.c b/servers/slapd/overlays/overlays.c
index aca15a350d..2eb6d4848c 100644
--- a/servers/slapd/overlays/overlays.c
+++ b/servers/slapd/overlays/overlays.c
@@ -50,7 +50,9 @@ static struct {
 	{ NULL, NULL }
 };
 
-int overlay_init() {
+int
+overlay_init(void)
+{
 	int i, rc = 0;
 
 	for ( i=0; funcs[i].name; i++ ) {
diff --git a/servers/slapd/proto-slap.h b/servers/slapd/proto-slap.h
index 3af0d579cf..67e5d4986d 100644
--- a/servers/slapd/proto-slap.h
+++ b/servers/slapd/proto-slap.h
@@ -844,6 +844,11 @@ LDAP_SLAPD_F (Operation *) slap_op_pop LDAP_P(( Operation **olist ));
 LDAP_SLAPD_F (Attribute *) slap_operational_subschemaSubentry( Backend *be );
 LDAP_SLAPD_F (Attribute *) slap_operational_hasSubordinate( int has );
 
+/*
+ * overlays.c
+ */
+LDAP_SLAPD_F (int) overlay_init( void );
+
 /*
  * passwd.c
  */