diff --git a/core/fifo.c b/core/fifo.c
index c59adb55..ddfa27aa 100644
--- a/core/fifo.c
+++ b/core/fifo.c
@@ -99,7 +99,7 @@ int uwsgi_master_fifo() {
 }
 
 int uwsgi_master_fifo_manage(int fd) {
-	char cmd;
+	unsigned char cmd;
 	ssize_t rlen = read(fd, &cmd, 1);
 	if (rlen < 0) {
 		if (uwsgi_is_again()) return 0;
@@ -114,11 +114,6 @@ int uwsgi_master_fifo_manage(int fd) {
 		return 0;
 	}
 
-	if ((int)cmd < 0) {
-		uwsgi_error("invalid cmd read in uwsgi_master_fifo_manage");
-		exit(1);
-	}
-
 	if (uwsgi_fifo_table[(int) cmd]) {
 		uwsgi_fifo_table[(int) cmd](0);
 	}