diff --git a/IkiWiki/Plugin/teximg.pm b/IkiWiki/Plugin/teximg.pm
index 3d6fa9942..e0f97614b 100644
--- a/IkiWiki/Plugin/teximg.pm
+++ b/IkiWiki/Plugin/teximg.pm
@@ -146,8 +146,8 @@ sub gen_image ($$$$) {
 	my $tex = $config{teximg_prefix};
 	$tex .= '\['.$code.'\]';
 	$tex .= $config{teximg_postfix};
-	$tex =~ s!\\documentclass{article}!\\documentclass[${height}pt]{article}!g;
-	$tex =~ s!\\documentclass{scrartcl}!\\documentclass[${height}pt]{scrartcl}!g;
+	$tex =~ s!\\documentclass\{article}!\\documentclass[${height}pt]{article}!g;
+	$tex =~ s!\\documentclass\{scrartcl}!\\documentclass[${height}pt]{scrartcl}!g;
 
 	my $tmp = eval { create_tmp_dir($digest) };
 	if (! $@ &&
diff --git a/pm_filter b/pm_filter
index 1e51f9dd3..8e1480564 100755
--- a/pm_filter
+++ b/pm_filter
@@ -28,6 +28,6 @@ elsif (/^use lib/) {
 elsif ($. == 1 && ($ENV{NOTAINT}=0) && m{^(#!.*perl.*?)$}) {
 	$_=qq{$1 -T\n};
 }
-elsif (/^\$ENV{PATH}="(.*)";/) {
+elsif (/^\$ENV\{PATH}="(.*)";/) {
 	$_="\$ENV{PATH}=\"$1:$prefix/bin\";\n";
 }
diff --git a/t/inline.t b/t/inline.t
index f2ffbbc2f..9bad525be 100755
--- a/t/inline.t
+++ b/t/inline.t
@@ -52,7 +52,7 @@ $blob = readfile("t/tmp/out/friends.html");
 like($blob, qr{\Q$add_new_post\E}, 'postform=yes forces postform');
 like($blob, qr{<input type="hidden" name="from" value="friends"},
 	'implicit rootpage is /friends');
-like($blob, qr[this page is {friends/garrus}.*this page is {friends/liara}]s,
+like($blob, qr[this page is \{friends/garrus}.*this page is \{friends/liara}]s,
 	'first two pages in desired sort order are present');
 unlike($blob, qr{friends/(?:midna|telma)},
 	'pages excluded by show should not be present');
@@ -62,7 +62,7 @@ unlike($blob, qr{\Q$add_new_post\E}, 'default is no postform');
 
 $blob = readfile("t/tmp/out/enemies.html");
 unlike($blob, qr{\Q$add_new_post\E}, 'postform=no forces no postform');
-like($blob, qr[this page is {enemies/zant}.*this page is {enemies/rachni}]s,
+like($blob, qr[this page is \{enemies/zant}.*this page is \{enemies/rachni}]s,
 	'first two pages in reversed sort order are present');
 unlike($blob, qr{enemies/(?:benezia|geth)},
 	'pages excluded by show should not be present');