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-rwxr-xr-xMaster/install-tl4
1 files changed, 2 insertions, 2 deletions
diff --git a/Master/install-tl b/Master/install-tl
index 741e9f9b57b..875589cc949 100755
--- a/Master/install-tl
+++ b/Master/install-tl
@@ -1206,9 +1206,9 @@ operations might be disturbed.\n\n";
# now work through the options if specified at all
my $env_paper = $ENV{"TEXLIVE_INSTALL_PAPER"};
- if ($env_paper eq "letter") {
+ if (defined $env_paper && $env_paper eq "letter") {
$vars{'instopt_letter'} = 1;
- } elsif ($env_paper eq "a4") {
+ } elsif (defined $env_paper && $env_paper eq "a4") {
; # do nothing
} elsif ($env_paper) {
tlwarn("$0: TEXLIVE_INSTALL_PAPER value must be letter or a4, not: "