diff --git a/fs_mgr/liblp/builder.cpp b/fs_mgr/liblp/builder.cpp
index d15fa8c..cff44b7 100644
--- a/fs_mgr/liblp/builder.cpp
+++ b/fs_mgr/liblp/builder.cpp
@@ -250,6 +250,7 @@
     geometry_.metadata_slot_count = metadata_slot_count;
     geometry_.alignment = device_info_.alignment;
     geometry_.alignment_offset = device_info_.alignment_offset;
+    geometry_.block_device_size = device_info_.size;
     return true;
 }
 
diff --git a/fs_mgr/liblp/include/liblp/metadata_format.h b/fs_mgr/liblp/include/liblp/metadata_format.h
index b5202f0..b69e138 100644
--- a/fs_mgr/liblp/include/liblp/metadata_format.h
+++ b/fs_mgr/liblp/include/liblp/metadata_format.h
@@ -129,6 +129,11 @@
      * If it cannot be determined, it is assumed to be 0.
      */
     uint32_t alignment_offset;
+
+    /* 72: Block device size, as specified when the metadata was created. This
+     * can be used to verify the geometry against a target device.
+     */
+    uint64_t block_device_size;
 } __attribute__((packed)) LpMetadataGeometry;
 
 /* The logical partition metadata has a number of tables; they are described
diff --git a/fs_mgr/liblp/utility_test.cpp b/fs_mgr/liblp/utility_test.cpp
index 2143e13..092dbf1 100644
--- a/fs_mgr/liblp/utility_test.cpp
+++ b/fs_mgr/liblp/utility_test.cpp
@@ -31,8 +31,16 @@
 }
 
 TEST(liblp, GetMetadataOffset) {
-    LpMetadataGeometry geometry = {
-            LP_METADATA_GEOMETRY_MAGIC, sizeof(geometry), {0}, 16384, 4, 10000, 80000, 0, 0};
+    LpMetadataGeometry geometry = {LP_METADATA_GEOMETRY_MAGIC,
+                                   sizeof(geometry),
+                                   {0},
+                                   16384,
+                                   4,
+                                   10000,
+                                   80000,
+                                   0,
+                                   0,
+                                   1024 * 1024};
     EXPECT_EQ(GetPrimaryMetadataOffset(geometry, 0), 4096);
     EXPECT_EQ(GetPrimaryMetadataOffset(geometry, 1), 4096 + 16384);
     EXPECT_EQ(GetPrimaryMetadataOffset(geometry, 2), 4096 + 16384 * 2);
diff --git a/fs_mgr/liblp/writer.cpp b/fs_mgr/liblp/writer.cpp
index b85e4ad..3ec76a9 100644
--- a/fs_mgr/liblp/writer.cpp
+++ b/fs_mgr/liblp/writer.cpp
@@ -108,6 +108,11 @@
         LERROR << "Not enough space to backup all logical partition metadata slots.";
         return false;
     }
+    if (blockdevice_size != metadata.geometry.block_device_size) {
+        LERROR << "Block device size " << blockdevice_size
+               << " does not match metadata requested size " << metadata.geometry.block_device_size;
+        return false;
+    }
 
     // Make sure all partition entries reference valid extents.
     for (const auto& partition : metadata.partitions) {