diff --git a/sys/arm64/arm64/gicv3_its.c b/sys/arm64/arm64/gicv3_its.c
--- a/sys/arm64/arm64/gicv3_its.c
+++ b/sys/arm64/arm64/gicv3_its.c
@@ -557,14 +557,13 @@
 			/* Clear the fields we will be setting */
 			reg &= ~(GITS_BASER_VALID | GITS_BASER_INDIRECT |
 			    GITS_BASER_CACHE_MASK | GITS_BASER_TYPE_MASK |
-			    GITS_BASER_ESIZE_MASK | GITS_BASER_PA_MASK |
+			    GITS_BASER_PA_MASK |
 			    GITS_BASER_SHARE_MASK | GITS_BASER_PSZ_MASK |
 			    GITS_BASER_SIZE_MASK);
 			/* Set the new values */
 			reg |= GITS_BASER_VALID |
 			    (cache << GITS_BASER_CACHE_SHIFT) |
 			    (type << GITS_BASER_TYPE_SHIFT) |
-			    ((esize - 1) << GITS_BASER_ESIZE_SHIFT) |
 			    paddr | (share << GITS_BASER_SHARE_SHIFT) |
 			    (nitspages - 1);