diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2223b0b..c7addaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Change Log
 
+* 2019-05-04 -- 1.0.0-alpha13 -- Fix #18 by removing more keys from properties when creating connections.
 * 2019-04-26 -- 1.0.0-alpha12 -- Fix #17 by renaming `:next.jdbc/sql-string` to `:next.jdbc/sql-params` (**BREAKING CHANGE!**) and pass whole vector.
 * 2019-04-24 -- 1.0.0-alpha11 -- Rename `:gen-fn` to `:builder-fn` (**BREAKING CHANGE!**); Fix #13 by adding documentation for `datafy`/`nav`/`:schema`; Fix #15 by automatically adding `:next.jdbc/sql-string` (as of 1.0.0-alpha12: `:next.jdbc/sql-params`) into the options hash map, so custom builders can depend on the SQL string.
 * 2019-04-22 -- 1.0.0-alpha9 -- Fix #14 by respecting `:gen-fn` (as of 1.0.0-alpha11: `:builder-fn`) in `execute-one` for `PreparedStatement`.
diff --git a/README.md b/README.md
index b2650c0..3be95a6 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ The latest versions on Clojars and on cljdoc:
 
 [![Clojars Project](https://clojars.org/seancorfield/next.jdbc/latest-version.svg)](https://clojars.org/seancorfield/next.jdbc) [![cljdoc badge](https://cljdoc.org/badge/seancorfield/next.jdbc)](https://cljdoc.org/d/seancorfield/next.jdbc/CURRENT)
 
-This documentation is for 1.0.0-alpha12.
+This documentation is for 1.0.0-alpha13.
 
 * [Getting Started](/doc/getting-started.md)
 * [Migrating from `clojure.java.jdbc`](/doc/migration-from-clojure-java-jdbc.md)
diff --git a/doc/getting-started.md b/doc/getting-started.md
index 3d408bf..267ec01 100644
--- a/doc/getting-started.md
+++ b/doc/getting-started.md
@@ -9,12 +9,12 @@ It is designed to work with Clojure 1.10 or later, supports `datafy`/`nav`, and
 You can add `next.jdbc` to your project with either:
 
 ```clojure
-{seancorfield/next.jdbc {:mvn/version "1.0.0-alpha12"}}
+{seancorfield/next.jdbc {:mvn/version "1.0.0-alpha13"}}
 ```
 for `deps.edn` or:
 
 ```clojure
-[seancorfield/next.jdbc "1.0.0-alpha12"]
+[seancorfield/next.jdbc "1.0.0-alpha13"]
 ```
 for `project.clj` or `build.boot`.
 
@@ -29,7 +29,7 @@ For the examples in this documentation, we will use a local H2 database on disk,
 ```clojure
 ;; deps.edn
 {:deps {org.clojure/clojure {:mvn/version "1.10.0"}
-        seancorfield/next.jdbc {:mvn/version "1.0.0-alpha12"}
+        seancorfield/next.jdbc {:mvn/version "1.0.0-alpha13"}
         com.h2database/h2 {:mvn/version "1.4.197"}}}
 ```
 
diff --git a/pom.xml b/pom.xml
index 0eec12f..681714d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>seancorfield</groupId>
   <artifactId>next.jdbc</artifactId>
-  <version>1.0.0-alpha12</version>
+  <version>1.0.0-alpha13</version>
   <name>next.jdbc</name>
 
   <description>The next generation of clojure.java.jdbc: a new low-level Clojure wrapper for JDBC-based access to databases.</description>
diff --git a/src/next/jdbc/connection.clj b/src/next/jdbc/connection.clj
index 8f65165..f6573de 100644
--- a/src/next/jdbc/connection.clj
+++ b/src/next/jdbc/connection.clj
@@ -104,7 +104,7 @@
                        host
                        (when port (str ":" port))
                        db-sep dbname))
-        etc (dissoc db-spec :dbtype :dbname)]
+        etc (dissoc db-spec :dbtype :dbname :host :port :classname)]
     ;; verify the datasource is loadable
     (if-let [class-name (or classname (classnames subprotocol))]
       (do