diff --git a/xtldr/volume.c b/xtldr/volume.c
index fa26438..74b6166 100644
--- a/xtldr/volume.c
+++ b/xtldr/volume.c
@@ -191,7 +191,7 @@ BlEnumerateBlockDevices()
 
             /* Print debug message */
             BlDebugPrint(L"Found Hard Disk partition (DiskNumber: %lu, PartNumber: %lu, "
-                         L"MBRType: %u, GUID: {%V}, PartSize: %uB) %S\n",
+                         L"MBRType: %u, GUID: {%V}, PartSize: %lluB) %S\n",
                          DriveNumber, PartitionNumber, HDPath->MBRType,
                          PartitionGuid, HDPath->PartitionSize * Media->BlockSize,
                          (DriveType & XTBL_BOOT_DEVICE_ESP) ? L"(ESP)" : L"");