diff --git a/build_gpt.sh b/build_gpt.sh
index 8247f65c68..84888a902c 100755
--- a/build_gpt.sh
+++ b/build_gpt.sh
@@ -119,8 +119,8 @@ fi
 
 # Create the GPT. This has the side-effect of setting some global vars
 # describing the partition table entries (see the comments in the source).
-install_gpt $OUTDEV $ROOTFS_IMG $STATEFUL_IMG $PMBRCODE $ESP_IMG \
-    false $FLAGS_rootfs_partition_size
+install_gpt $OUTDEV $(numsectors $ROOTFS_IMG) $(numsectors $STATEFUL_IMG) \
+    $PMBRCODE $(numsectors $ESP_IMG) false $FLAGS_rootfs_partition_size
 
 if [[ "$ARCH" = "arm" ]]; then
   # assume /dev/mmcblk1. we could not get this from ${OUTDEV}
diff --git a/image_to_vm.sh b/image_to_vm.sh
index ac8f648c99..f1b977705b 100755
--- a/image_to_vm.sh
+++ b/image_to_vm.sh
@@ -229,8 +229,9 @@ sudo dd if=/dev/zero of="${TEMP_IMG}" bs=1 count=1 \
   seek=$((${FLAGS_vdisk_size} * 1024 * 1024 - 1))
 
 # Set up the partition table
-install_gpt "${TEMP_IMG}" "${TEMP_ROOTFS}" "${TEMP_STATE}" \
-  "${TEMP_PMBR}" "${TEMP_ESP}" false ${FLAGS_rootfs_partition_size}
+install_gpt "${TEMP_IMG}" "$(numsectors $TEMP_ROOTFS)" \
+  "$(numsectors $TEMP_STATE)" "${TEMP_PMBR}" "$(numsectors $TEMP_ESP)" \
+  false ${FLAGS_rootfs_partition_size}
 # Copy into the partition parts of the file
 dd if="${TEMP_ROOTFS}" of="${TEMP_IMG}" conv=notrunc bs=512 \
   seek="${START_ROOTFS_A}"
diff --git a/mod_image_for_dev_recovery.sh b/mod_image_for_dev_recovery.sh
index 1a13047ea4..3ff2161335 100755
--- a/mod_image_for_dev_recovery.sh
+++ b/mod_image_for_dev_recovery.sh
@@ -115,8 +115,9 @@ update_partition_table() {
   dd if="${FLAGS_dev_install_shim}" of="${TEMP_PMBR}" bs=512 count=1
 
   # Set up a new partition table
-  install_gpt "${TEMP_IMG}" "${TEMP_ROOTFS}" "${TEMP_STATE}" "${TEMP_PMBR}" \
-    "${TEMP_ESP}" false $(roundup $(numsectors ${TEMP_ROOTFS}))
+  install_gpt "${TEMP_IMG}" "$(numsectors $TEMP_ROOTFS)" \
+    "$(numsectors $TEMP_STATE)" "${TEMP_PMBR}" "$(numsectors $TEMP_ESP)" \
+    false $(roundup $(numsectors ${TEMP_ROOTFS}))
 
   # Copy into the partition parts of the file
   dd if="${TEMP_ROOTFS}" of="${TEMP_IMG}" conv=notrunc bs=512 \