diff --git a/src/fcgi-app.c b/src/fcgi-app.c
index 829d1b128b..148ab5e222 100644
--- a/src/fcgi-app.c
+++ b/src/fcgi-app.c
@@ -591,6 +591,12 @@ static int proxy_parse_use_fcgi_app(char **args, int section, struct proxy *curp
 		goto end;
         }
 
+	if (curpx->mode != PR_MODE_TCP && curpx->mode != PR_MODE_HTTP) {
+		memprintf(err, "'%s' requires TCP or HTTP mode", args[0]);
+		retval = -1;
+		goto end;
+        }
+
 	if (!*(args[1])) {
 		memprintf(err, "'%s' expects <name> as argument", args[0]);
 		retval = -1;