diff --git a/src/interfaces/libpq/fe-secure-openssl.c b/src/interfaces/libpq/fe-secure-openssl.c
index c83c1acae4..f474c96f5f 100644
--- a/src/interfaces/libpq/fe-secure-openssl.c
+++ b/src/interfaces/libpq/fe-secure-openssl.c
@@ -996,6 +996,7 @@ initialize_SSL(PGconn *conn)
 #endif
 			}
 			/* if not found, silently ignore;  we do not require CRL */
+			ERR_clear_error();
 		}
 		have_rootcert = true;
 	}