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-rw-r--r--lib/Format/Encoding.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Format/Encoding.h b/lib/Format/Encoding.h
index fe3d5f019858..a0d664121b2b 100644
--- a/lib/Format/Encoding.h
+++ b/lib/Format/Encoding.h
@@ -67,7 +67,8 @@ inline unsigned columnWidthWithTabs(StringRef Text, unsigned StartColumn,
if (TabPos == StringRef::npos)
return TotalWidth + columnWidth(Tail, Encoding);
TotalWidth += columnWidth(Tail.substr(0, TabPos), Encoding);
- TotalWidth += TabWidth - (TotalWidth + StartColumn) % TabWidth;
+ if (TabWidth)
+ TotalWidth += TabWidth - (TotalWidth + StartColumn) % TabWidth;
Tail = Tail.substr(TabPos + 1);
}
}