diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index 0ac0017..01d792f 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -1430,7 +1430,7 @@
 
 void
 ngx_sort(void *base, size_t n, size_t size,
-    int (*cmp)(const void *, const void *))
+    ngx_int_t (*cmp)(const void *, const void *))
 {
     u_char  *p1, *p2, *p;
 
diff --git a/src/core/ngx_string.h b/src/core/ngx_string.h
index 4fe5cb6..00617f3 100644
--- a/src/core/ngx_string.h
+++ b/src/core/ngx_string.h
@@ -173,7 +173,7 @@
 
 
 void ngx_sort(void *base, size_t n, size_t size,
-    int (*cmp)(const void *, const void *));
+    ngx_int_t (*cmp)(const void *, const void *));
 #define ngx_qsort             qsort
 
 
diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 2286663..3ef1dcb 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -19,7 +19,7 @@
 static char *ngx_http_merge_locations(ngx_conf_t *cf,
     ngx_array_t *locations, void **loc_conf, ngx_http_module_t *module,
     ngx_uint_t ctx_index);
-static int ngx_http_cmp_conf_in_addrs(const void *one, const void *two);
+static ngx_int_t ngx_http_cmp_conf_in_addrs(const void *one, const void *two);
 static int ngx_libc_cdecl ngx_http_cmp_dns_wildcards(const void *one,
     const void *two);
 
@@ -1089,7 +1089,7 @@
 }
 
 
-static int
+static ngx_int_t
 ngx_http_cmp_conf_in_addrs(const void *one, const void *two)
 {
     ngx_http_conf_in_addr_t  *first, *second;
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 08c1d35..ec307cb 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -45,7 +45,8 @@
     void *dummy);
 static char *ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd,
     void *dummy);
-static int ngx_http_core_cmp_locations(const void *first, const void *second);
+static ngx_int_t ngx_http_core_cmp_locations(const void *first,
+    const void *second);
 
 static char *ngx_http_core_types(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
@@ -2297,7 +2298,7 @@
 }
 
 
-static int
+static ngx_int_t
 ngx_http_core_cmp_locations(const void *one, const void *two)
 {
     ngx_int_t                  rc;
diff --git a/src/http/ngx_http_upstream_round_robin.c b/src/http/ngx_http_upstream_round_robin.c
index c25c076..0621371 100644
--- a/src/http/ngx_http_upstream_round_robin.c
+++ b/src/http/ngx_http_upstream_round_robin.c
@@ -9,7 +9,8 @@
 #include <ngx_http.h>
 
 
-static int ngx_http_upstream_cmp_servers(const void *one, const void *two);
+static ngx_int_t ngx_http_upstream_cmp_servers(const void *one,
+    const void *two);
 static ngx_uint_t
 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers);
 
@@ -185,7 +186,7 @@
 }
 
 
-static int
+static ngx_int_t
 ngx_http_upstream_cmp_servers(const void *one, const void *two)
 {
     ngx_http_upstream_rr_peer_t  *first, *second;
diff --git a/src/mail/ngx_mail.c b/src/mail/ngx_mail.c
index 95d29e8..00c2550 100644
--- a/src/mail/ngx_mail.c
+++ b/src/mail/ngx_mail.c
@@ -11,7 +11,7 @@
 
 
 static char *ngx_mail_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
-static int ngx_mail_cmp_conf_in_addrs(const void *one, const void *two);
+static ngx_int_t ngx_mail_cmp_conf_in_addrs(const void *one, const void *two);
 
 
 ngx_uint_t  ngx_mail_max_module;
@@ -388,7 +388,7 @@
 }
 
 
-static int
+static ngx_int_t
 ngx_mail_cmp_conf_in_addrs(const void *one, const void *two)
 {
     ngx_mail_conf_in_addr_t  *first, *second;