diff --git a/devicemodel/hw/pci/virtio/rpmb_sim.c b/devicemodel/hw/pci/virtio/rpmb_sim.c
index 2e44391b6..e144569db 100644
--- a/devicemodel/hw/pci/virtio/rpmb_sim.c
+++ b/devicemodel/hw/pci/virtio/rpmb_sim.c
@@ -108,25 +108,6 @@ err:
 	return hmac_ret ? 0 : -1;
 }
 
-static int rpmb_sim_open(const char *rpmb_devname)
-{
-	rpmb_fd = fopen(rpmb_devname, "rb+");
-
-	if (rpmb_fd == NULL) {
-		/*if the rpmb device file does not exist, create a new file*/
-		rpmb_fd = fopen(rpmb_devname, "wb+");
-		DPRINTF(("rpmb device file(%s) does not exist, create a new file\n", rpmb_devname));
-	}
-
-	if (rpmb_fd == NULL) {
-		DPRINTF(("%s: unable (%d) to open rpmb device '%s': %s\n",
-			__func__, errno, rpmb_devname, strerror(errno)));
-		return -1;
-	}
-
-	return 0;
-}
-
 static void rpmb_sim_close(void)
 {
 	fclose(rpmb_fd);
@@ -171,6 +152,31 @@ static int file_read(FILE *fp, void *buf, size_t size, off_t offset)
 	}
 }
 
+static int rpmb_sim_open(const char *rpmb_devname)
+{
+	uint8_t data = 0;
+	rpmb_fd = fopen(rpmb_devname, "rb+");
+
+	if (rpmb_fd == NULL) {
+		/*if the rpmb device file does not exist, create a new file*/
+		rpmb_fd = fopen(rpmb_devname, "wb+");
+		DPRINTF(("rpmb device file(%s) does not exist, create a new file\n", rpmb_devname));
+		/* Write 0 to the last byte to enable 4MB length access */
+		if (file_write(rpmb_fd, &data, 1, TEEDATA_SIZE - 1) < 0) {
+			DPRINTF(("Failed to initialize simulated rpmb to 0.\n"));
+			rpmb_fd = NULL;
+		}
+	}
+
+	if (rpmb_fd == NULL) {
+		DPRINTF(("%s: unable (%d) to open rpmb device '%s': %s\n",
+			__func__, errno, rpmb_devname, strerror(errno)));
+		return -1;
+	}
+
+	return 0;
+}
+
 static int get_counter(uint32_t *counter)
 {
 	int rc = 0;