diff --git a/src/dnssec-openssl.c b/src/dnssec-openssl.c
index 1159e2a..2f1c838 100644
--- a/src/dnssec-openssl.c
+++ b/src/dnssec-openssl.c
@@ -185,7 +185,7 @@ static const int valgctx_size[] =
   sizeof(VerifyAlgCtx),     /*  3: DSA */
   0,                        /*  4: ECC */
   sizeof(VerifyAlgCtx),     /*  5: RSASHA1 */
-  0,                        /*  6: DSA-NSEC3-SHA1 */
+  sizeof(VerifyAlgCtx),     /*  6: DSA-NSEC3-SHA1 */
   sizeof(VerifyAlgCtx),     /*  7: RSASHA1-NSEC3-SHA1 */
   sizeof(VerifyAlgCtx),     /*  8: RSASHA256 */
   0,                        /*  9: unassigned */