diff --git a/src/blockstore/blockstore_disk.h b/src/blockstore/blockstore_disk.h
index b10a63e0..0afbe124 100644
--- a/src/blockstore/blockstore_disk.h
+++ b/src/blockstore/blockstore_disk.h
@@ -27,13 +27,13 @@ struct blockstore_disk_t
     // Required write alignment and journal/metadata/data areas' location alignment
     uint32_t disk_alignment = 4096;
     // Journal block size - minimum_io_size of the journal device is the best choice
-    uint64_t journal_block_size = 4096;
+    uint32_t journal_block_size = 4096;
     // Metadata block size - minimum_io_size of the metadata device is the best choice
-    uint64_t meta_block_size = 4096;
+    uint32_t meta_block_size = 4096;
     // Target free space in metadata blocks
     uint32_t meta_block_target_free_space = 800;
     // Sparse write tracking granularity. 4 KB is a good choice. Must be a multiple of disk_alignment
-    uint64_t bitmap_granularity = 4096;
+    uint32_t bitmap_granularity = 4096;
     // Data checksum type, BLOCKSTORE_CSUM_NONE or BLOCKSTORE_CSUM_CRC32C
     uint32_t data_csum_type = BLOCKSTORE_CSUM_NONE;
     // Checksum block size, must be a multiple of bitmap_granularity
diff --git a/src/blockstore/blockstore_heap.cpp b/src/blockstore/blockstore_heap.cpp
index 05b0bad7..115a3a5c 100644
--- a/src/blockstore/blockstore_heap.cpp
+++ b/src/blockstore/blockstore_heap.cpp
@@ -272,7 +272,7 @@ uint64_t blockstore_heap_t::load_blocks(uint64_t disk_offset, uint64_t size, uin
             }
             if (region_marker > dsk->meta_block_size-block_offset)
             {
-                fprintf(stderr, "Warning: Entry is too large in metadata block %u at %u (%u > max %ju bytes), skipping the rest of block\n",
+                fprintf(stderr, "Warning: Entry is too large in metadata block %u at %u (%u > max %u bytes), skipping the rest of block\n",
                     block_num, block_offset, region_marker, dsk->meta_block_size-block_offset);
                 if (fail_on_warn)
                     abort();
diff --git a/src/blockstore/blockstore_init.cpp b/src/blockstore/blockstore_init.cpp
index 2bc2787e..8300d0ac 100644
--- a/src/blockstore/blockstore_init.cpp
+++ b/src/blockstore/blockstore_init.cpp
@@ -145,7 +145,7 @@ resume_1:
             printf(
                 "Configuration stored in metadata superblock"
                 " (meta_block_size=%u, data_block_size=%u, bitmap_granularity=%u, data_csum_type=%u, csum_block_size=%u)"
-                " differs from OSD configuration (%ju/%u/%ju, %u/%u).\n",
+                " differs from OSD configuration (%u/%u/%u, %u/%u).\n",
                 hdr->meta_block_size, hdr->data_block_size, hdr->bitmap_granularity,
                 hdr->data_csum_type, hdr->csum_block_size,
                 bs->dsk.meta_block_size, bs->dsk.data_block_size, bs->dsk.bitmap_granularity,