diff --git a/src/Text.cpp b/src/Text.cpp
index d81dd868ad..c003350781 100644
--- a/src/Text.cpp
+++ b/src/Text.cpp
@@ -907,11 +907,11 @@ void Text::insertChar(Cursor & cur, char_type c)
 	if (lyxrc.auto_number) {
 		static docstring const number_operators = from_ascii("+-/*");
 		static docstring const number_unary_operators = from_ascii("+-");
-		static docstring const number_seperators = from_ascii(".,:");
+		static docstring const number_separators = from_ascii(".,:");
 
 		if (cur.current_font.fontInfo().number() == FONT_ON) {
 			if (!isDigitASCII(c) && !contains(number_operators, c) &&
-			    !(contains(number_seperators, c) &&
+			    !(contains(number_separators, c) &&
 			      cur.pos() != 0 &&
 			      cur.pos() != cur.lastpos() &&
 			      tm.displayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
@@ -932,7 +932,7 @@ void Text::insertChar(Cursor & cur, char_type c)
 				  ) {
 					setCharFont(pit, cur.pos() - 1, cur.current_font,
 						tm.font_);
-				} else if (contains(number_seperators, c)
+				} else if (contains(number_separators, c)
 				     && cur.pos() >= 2
 				     && tm.displayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 					setCharFont(pit, cur.pos() - 1, cur.current_font,