diff --git a/ssl/test/bssl_shim.cc b/ssl/test/bssl_shim.cc
index 74674a49..dde25b44 100644
--- a/ssl/test/bssl_shim.cc
+++ b/ssl/test/bssl_shim.cc
@@ -747,6 +747,8 @@ static ScopedSSL_CTX SetupCtx(const TestConfig *config) {
         !BN_set_word(dh->g, 2)) {
       return nullptr;
     }
+    BN_free(dh->q);
+    dh->q = NULL;
     dh->priv_length = 0;
   }