diff --git a/drivers/mtd/nor/spi_nor.c b/drivers/mtd/nor/spi_nor.c
index 8111efd..6b4643e 100644
--- a/drivers/mtd/nor/spi_nor.c
+++ b/drivers/mtd/nor/spi_nor.c
@@ -131,7 +131,7 @@
 		return ret;
 	}
 
-	if ((sr & SR_QUAD_EN_MX) == 0U) {
+	if ((sr & SR_QUAD_EN_MX) != 0U) {
 		return 0;
 	}