diff --git a/tests/source/environment_lines.tex b/tests/source/environment_lines.tex
index 969f697..a4a11b6 100644
--- a/tests/source/environment_lines.tex
+++ b/tests/source/environment_lines.tex
@@ -5,6 +5,7 @@
 \newenvironment{env1}{}{}
 \newenvironment{env2}{}{}
 \newenvironment{env3}{}{}
+\newenvironment{env4}{}{}
 
 % environments on separate lines
 \begin{env1}
diff --git a/tests/target/environment_lines.tex b/tests/target/environment_lines.tex
index c75202c..b58fc5e 100644
--- a/tests/target/environment_lines.tex
+++ b/tests/target/environment_lines.tex
@@ -5,6 +5,7 @@
 \newenvironment{env1}{}{}
 \newenvironment{env2}{}{}
 \newenvironment{env3}{}{}
+\newenvironment{env4}{}{}
 
 % environments on separate lines
 \begin{env1}