diff --git a/crypto/fipsmodule/sha/asm/sha1-x86_64.pl b/crypto/fipsmodule/sha/asm/sha1-x86_64.pl
index fd4ff2a..df7cbc3 100755
--- a/crypto/fipsmodule/sha/asm/sha1-x86_64.pl
+++ b/crypto/fipsmodule/sha/asm/sha1-x86_64.pl
@@ -2122,4 +2122,4 @@
 
 	print $_,"\n";
 }
-close STDOUT;
+close STDOUT or die "error closing STDOUT";