diff --git a/chipset_enable.c b/chipset_enable.c
index 0395df6..84e19be 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -511,7 +511,7 @@
 	unsigned char buf[8];
 
 	fd_msr = open("/dev/cpu/0/msr", O_RDWR);
-	if (!fd_msr) {
+	if (fd_msr == -1) {
 		perror("open msr");
 		return -1;
 	}