diff --git a/src/interfaces/libpq/fe-secure-openssl.c b/src/interfaces/libpq/fe-secure-openssl.c
index fc723cc083..0d0a3660f5 100644
--- a/src/interfaces/libpq/fe-secure-openssl.c
+++ b/src/interfaces/libpq/fe-secure-openssl.c
@@ -999,6 +999,7 @@ initialize_SSL(PGconn *conn)
 #endif
 			}
 			/* if not found, silently ignore;  we do not require CRL */
+			ERR_clear_error();
 		}
 		have_rootcert = true;
 	}