diff --git a/src/lib/edid.c b/src/lib/edid.c
index 07850ee..7db1bc3 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -525,14 +525,14 @@
 do_checksum(unsigned char *x)
 {
 	int valid = 0;
-	printk(BIOS_SPEW, "Checksum: 0x%hx", x[0x7f]);
+	printk(BIOS_SPEW, "Checksum: 0x%hhx", x[0x7f]);
 	{
 		unsigned char sum = 0;
 		int i;
 		for (i = 0; i < 128; i++)
 			sum += x[i];
 		if (sum) {
-			printk(BIOS_SPEW, " (should be 0x%hx)", (unsigned char)(x[0x7f] - sum));
+			printk(BIOS_SPEW, " (should be 0x%hhx)", (unsigned char)(x[0x7f] - sum));
 		} else {
 			valid = 1;
 			printk(BIOS_SPEW, " (valid)");
@@ -1003,7 +1003,7 @@
 		if (edid[0x11] > 0x0f) {
 			if (edid[0x10] == 0xff) {
 				c.has_valid_year = 1;
-				printk(BIOS_SPEW, "Made week %hd of model year %hd\n", edid[0x10],
+				printk(BIOS_SPEW, "Made week %hhd of model year %hhd\n", edid[0x10],
 				       edid[0x11]);
 				out->week = edid[0x10];
 				out->year = edid[0x11];
@@ -1011,7 +1011,7 @@
 				/* we know it's at least 2013, when this code was written */
 				if (edid[0x11] + 90 <= 2013) {
 					c.has_valid_year = 1;
-					printk(BIOS_SPEW, "Made week %hd of %hd\n",
+					printk(BIOS_SPEW, "Made week %hhd of %hhd\n",
 					       edid[0x10], edid[0x11] + 1990);
 					out->week = edid[0x10];
 					out->year = edid[0x11] + 1990;
@@ -1020,7 +1020,7 @@
 		}
 	}
 
-	printk(BIOS_SPEW, "EDID version: %hd.%hd\n", edid[0x12], edid[0x13]);
+	printk(BIOS_SPEW, "EDID version: %hhd.%hhd\n", edid[0x12], edid[0x13]);
 	out->version[0] = edid[0x12];
 	out->version[1] = edid[0x13];