diff --git a/src/tex2lyx/Preamble.cpp b/src/tex2lyx/Preamble.cpp
index 756db7da59..b7e28742f3 100644
--- a/src/tex2lyx/Preamble.cpp
+++ b/src/tex2lyx/Preamble.cpp
@@ -1554,7 +1554,10 @@ void Preamble::parse(Parser & p, string const & forceclass,
 
 			// remove LyX-specific definitions that are re-added by LyX
 			// if necessary
-			if (name == "\\lyxdot" || name == "\\lyxarrow") {
+			// \lyxline is an ancient command that is converted by tex2lyx into
+			// a \rule therefore remove its preamble code
+			if (name == "\\lyxdot" || name == "\\lyxarrow"
+				|| name == "\\lyxline") {
 				p.skip_spaces();
 				in_lyx_preamble = true;
 			}
diff --git a/src/tex2lyx/test/test-insets-basic.tex b/src/tex2lyx/test/test-insets-basic.tex
index ffd6d6dd31..32f6ad4544 100644
--- a/src/tex2lyx/test/test-insets-basic.tex
+++ b/src/tex2lyx/test/test-insets-basic.tex
@@ -479,7 +479,7 @@ The following tow don't work, but they should???
 
 test
 
-{\tiny{}\rule[0.5ex]{1\linewidth}{1pt}}{\tiny \par}
+{\tiny \rule[0.5ex]{1\linewidth}{1pt}}{\tiny \par}
 
 test {\Huge Test} {\tiny test} test
 
diff --git a/src/tex2lyx/test/test-insets.tex b/src/tex2lyx/test/test-insets.tex
index 782b14b2ea..013fd57570 100644
--- a/src/tex2lyx/test/test-insets.tex
+++ b/src/tex2lyx/test/test-insets.tex
@@ -502,7 +502,7 @@ The following tow don't work, but they should???
 
 test
 
-{\tiny{}\rule[0.5ex]{1\linewidth}{1pt}}{\tiny \par}
+{\tiny \rule[0.5ex]{1\linewidth}{1pt}}{\tiny \par}
 
 test {\Huge Test} {\tiny test} test