diff --git a/src/rowpainter.C b/src/rowpainter.C
index 4f0fecfa22..7be384bfdf 100644
--- a/src/rowpainter.C
+++ b/src/rowpainter.C
@@ -267,6 +267,7 @@ void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 	str += par_.getChar(pos);
 #else
 	std::vector<char_type> str;
+	str.reserve(100);
 	str.push_back(par_.getChar(pos));
 #endif
 	if (arabic) {
diff --git a/src/support/textutils.h b/src/support/textutils.h
index 40521ec461..c0f3850a6c 100644
--- a/src/support/textutils.h
+++ b/src/support/textutils.h
@@ -50,7 +50,7 @@ bool isPrintable(lyx::char_type c)
 inline
 bool isPrintableNonspace(lyx::char_type c)
 {
-	return isPrintable(c) && c != ' ';
+	return (c & 127) > ' ';
 }
 
 /// return true if a unicode char is a digit.