diff --git a/bin/dnssec/dnssec-keygen.c b/bin/dnssec/dnssec-keygen.c
index 5f463b1b7a2f1ed9e1cdb2376c4b4d6e0e4d4d24..90b2f581bf06f67be2f88be79fd446437c4785dd 100644
--- a/bin/dnssec/dnssec-keygen.c
+++ b/bin/dnssec/dnssec-keygen.c
@@ -308,7 +308,7 @@ main(int argc, char **argv) {
 		case 'e':
 			fprintf(stderr,
 				"phased-out option -e "
-				"(was 'use (RSA) large exponent)\n");
+				"(was 'use (RSA) large exponent')\n");
 			break;
 		case 'f':
 			c = (unsigned char)(isc_commandline_argument[0]);