diff --git a/src/tex2lyx/text.cpp b/src/tex2lyx/text.cpp
index 919f454c66..ed866355ff 100644
--- a/src/tex2lyx/text.cpp
+++ b/src/tex2lyx/text.cpp
@@ -528,6 +528,17 @@ string guessQuoteStyle(string in, bool const opening)
 }
 
 
+string const fromPolyglossiaEnvironment(string const s)
+{
+	// Since \arabic is taken by the LaTeX kernel,
+	// the Arabic polyglossia environment is upcased
+	if (s == "Arabic")
+		return "arabic";
+	else
+		return s;
+}
+
+
 } // namespace
 
 
@@ -1602,7 +1613,8 @@ void parse_environment(Parser & p, ostream & os, bool outer,
 			break;
 		}
 
-		if (is_known(name, preamble.polyglossia_languages)) {
+		// We need to use fromPolyglossiaEnvironment die to Arabic > arabic
+		if (is_known(fromPolyglossiaEnvironment(name), preamble.polyglossia_languages)) {
 			// We must begin a new paragraph if not already done
 			if (! parent_context.atParagraphStart()) {
 				parent_context.check_end_layout(os);
@@ -1610,7 +1622,8 @@ void parse_environment(Parser & p, ostream & os, bool outer,
 			}
 			// save the language in the context so that it is
 			// handled by parse_text
-			parent_context.font.language = preamble.polyglossia2lyx(name);
+			parent_context.font.language =
+				preamble.polyglossia2lyx(fromPolyglossiaEnvironment(name));
 			parse_text(p, os, FLAG_END, outer, parent_context);
 			// Just in case the environment is empty
 			parent_context.extra_stuff.erase();
@@ -3497,7 +3510,6 @@ void parse_text(Parser & p, ostream & os, unsigned flags, bool outer,
 			continue;
 		}
 
-
 		// Starred section headings
 		// Must attempt to parse "Section*" before "Section".
 		if ((p.next_token().asInput() == "*") &&