diff --git a/src/drive.cpp b/src/drive.cpp
index 78b99ed..5ae0b7e 100644
--- a/src/drive.cpp
+++ b/src/drive.cpp
@@ -62,6 +62,10 @@ string Drive::sCapacityToText()
         dSize /= 1000;
         u16UnitIndex++;
     }
+    if (u16UnitIndex >= 9)
+    {
+        u16UnitIndex = 8;
+    }
     int precision = (u16UnitIndex >= 3) ? (u16UnitIndex - 3) : 0;
     sprintf(acBuffer, "%.*f %s", precision, dSize, units[u16UnitIndex]);
     return acBuffer;