diff --git a/include/types/global.h b/include/types/global.h
index 82a8e9d..241afe9 100644
--- a/include/types/global.h
+++ b/include/types/global.h
@@ -176,6 +176,9 @@
 #define WARN_BLOCK_DEPRECATED       0x00000001
 #define WARN_REQSETBE_DEPRECATED    0x00000002
 #define WARN_REDISPATCH_DEPRECATED  0x00000004
+#define WARN_CLITO_DEPRECATED       0x00000008
+#define WARN_SRVTO_DEPRECATED       0x00000010
+#define WARN_CONTO_DEPRECATED       0x00000020
 
 /* to be used with warned and WARN_* */
 static inline int already_warned(unsigned int warning)
diff --git a/src/proxy.c b/src/proxy.c
index ee7ffd7..8e638c6 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -139,6 +139,7 @@
 	const char *res, *name;
 	int *tv = NULL;
 	int *td = NULL;
+	int warn = 0;
 
 	retval = 0;
 
@@ -147,7 +148,7 @@
 		args++;
 
 	name = args[0];
-	if (!strcmp(args[0], "client") || !strcmp(args[0], "clitimeout")) {
+	if (!strcmp(args[0], "client") || (!strcmp(args[0], "clitimeout") && (warn = WARN_CLITO_DEPRECATED))) {
 		name = "client";
 		tv = &proxy->timeout.client;
 		td = &defpx->timeout.client;
@@ -164,12 +165,12 @@
 		tv = &proxy->timeout.httpreq;
 		td = &defpx->timeout.httpreq;
 		cap = PR_CAP_FE | PR_CAP_BE;
-	} else if (!strcmp(args[0], "server") || !strcmp(args[0], "srvtimeout")) {
+	} else if (!strcmp(args[0], "server") || (!strcmp(args[0], "srvtimeout") && (warn = WARN_SRVTO_DEPRECATED))) {
 		name = "server";
 		tv = &proxy->timeout.server;
 		td = &defpx->timeout.server;
 		cap = PR_CAP_BE;
-	} else if (!strcmp(args[0], "connect") || !strcmp(args[0], "contimeout")) {
+	} else if (!strcmp(args[0], "connect") || (!strcmp(args[0], "contimeout") && (warn = WARN_CONTO_DEPRECATED))) {
 		name = "connect";
 		tv = &proxy->timeout.connect;
 		td = &defpx->timeout.connect;
@@ -215,6 +216,13 @@
 		memprintf(err, "overwriting 'timeout %s' which was already specified", name);
 		retval = 1;
 	}
+	else if (warn) {
+		if (!already_warned(warn)) {
+			memprintf(err, "the '%s' directive is now deprecated in favor of 'timeout %s', and will not be supported in future versions.",
+				  args[0], name);
+			retval = 1;
+		}
+	}
 
 	*tv = MS_TO_TICKS(timeout);
 	return retval;