diff --git a/gptcurses.cc b/gptcurses.cc
index 0e18f8f..6002077 100644
--- a/gptcurses.cc
+++ b/gptcurses.cc
@@ -332,7 +332,7 @@
           BytesToIeee(partitions[partNum].GetFirstLBA(), blockSize).c_str());
    printw("Last sector: %lld (at %s)\n", partitions[partNum].GetLastLBA(),
           BytesToIeee(partitions[partNum].GetLastLBA(), blockSize).c_str());
-   size = partitions[partNum].GetLastLBA() - partitions[partNum].GetFirstLBA() + 1;
+   size = partitions[partNum].GetLastLBA() - partitions[partNum].GetFirstLBA();
    printw("Partition size: %lld sectors (%s)\n", size, BytesToIeee(size, blockSize).c_str());
    printw("Attribute flags: %016x\n", partitions[partNum].GetAttributes().GetAttributes());
    #ifdef USE_UTF16