diff --git a/tex-thumbnailer/tex-thumbnailer b/tex-thumbnailer/tex-thumbnailer
index ec69f49..c946a64 100644
--- a/tex-thumbnailer/tex-thumbnailer
+++ b/tex-thumbnailer/tex-thumbnailer
@@ -38,12 +38,12 @@ C1=`grep -c "begin{document}" "${ifile}"`
 C2=`grep -c "end{document}" "${ifile}"`
 
 if [ $C1 -lt "1" ]; then
-    echo "tex-thumbnailer: no \begin{document}"
+    printf "%s\n" "tex-thumbnailer: no \begin{document}"
     exit 1
 fi
 
 if [ $C2 -lt "1" ]; then
-    echo "tex-thumbnailer: no \end{document}"
+    printf "%s\n" "tex-thumbnailer: no \end{document}"
     exit 1
 fi