diff --git a/edithtml.sh b/edithtml.sh
index fc113efd..353428d5 100755
--- a/edithtml.sh
+++ b/edithtml.sh
@@ -15,7 +15,7 @@ if [ "x$1" = "x--rst" ]; then
     sed -i.sedbak 's|</head>|<meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="css/style.css"></head>|' $2
     sed -i.sedbak 's|http://cdn.mathjax.org/mathjax/latest/MathJax.js|https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js|' $2
 else
-    cat - $2 >$2.prefix <<EOF
+    cat - "$2" >"$2".prefix <<EOF
 <!DOCTYPE html>
 <html>
 <head>
@@ -26,14 +26,14 @@ else
 </head>
 <body>
 EOF
-    cat $2.prefix - >$2 <<EOF
+    cat "$2.prefix" - >"$2" <<EOF
 </body>
 </html>
 EOF
-    rm -f $2.prefix
+    rm -f "$2".prefix
 fi
 
-sed -i.sedbak 's|<a href="\([^":]*\).rst">|<a href="\1">|g' $2
+sed -i.sedbak 's|<a href="\([^":]*\).rst">|<a href="\1">|g' "$2"
 
 perl -i.sedbak -p0e 's|<section id="([^"]*)">\s*.?\s*<h([1-9])>([^<]*(?:<code>[^<]*</code>[^<]*)?)</h([1-9])>|<section id="\1"><h\2><span class="section-heading">\3</span><span class="section-anchor"> <a href="#\1"><img width="24" height="24" src="assets/images/section-anchor.png" alt=""></a></span></h\4>|g' "$2"
 
