diff --git a/crypto/ec/asm/x25519-x86_64.pl b/crypto/ec/asm/x25519-x86_64.pl
index 68a7771a9231186f92a240b0019884724c07b3c8..9a5693965efcf1809c26bd867081cdb4640d5697 100755
--- a/crypto/ec/asm/x25519-x86_64.pl
+++ b/crypto/ec/asm/x25519-x86_64.pl
@@ -815,4 +815,4 @@ ___
 
 $code =~ s/\`([^\`]*)\`/eval $1/gem;
 print $code;
-close $STDOUT;
+close STDOUT;