diff --git a/tests/certs/genserv.pl b/tests/certs/genserv.pl
index 2e722396ac..42aba5370e 100755
--- a/tests/certs/genserv.pl
+++ b/tests/certs/genserv.pl
@@ -50,7 +50,7 @@ my $PREFIX;
 
 my $CAPREFIX = shift @ARGV;
 if(!$CAPREFIX) {
-    print 'Usage: genserv.pl <caprefix> [<prefix> ...]\n';
+    print "Usage: genserv.pl <caprefix> [<prefix> ...]\n";
     exit 1;
 } elsif(! -f "$CAPREFIX-ca.cacert" ||
         ! -f "$CAPREFIX-ca.key") {