diff --git a/bin/dnssec/dnssec-keygen.c b/bin/dnssec/dnssec-keygen.c
index f57021c912336d49245f3fd8e5a442a08b34f0af..1476d0dde590a56d4a5e33413a97d978e52d0450 100644
--- a/bin/dnssec/dnssec-keygen.c
+++ b/bin/dnssec/dnssec-keygen.c
@@ -333,7 +333,7 @@ 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]);