diff --git a/core/src/main/scala/com/lightbend/paradox/markdown/Directive.scala b/core/src/main/scala/com/lightbend/paradox/markdown/Directive.scala
index bab81b96..c4e9ec26 100644
--- a/core/src/main/scala/com/lightbend/paradox/markdown/Directive.scala
+++ b/core/src/main/scala/com/lightbend/paradox/markdown/Directive.scala
@@ -310,8 +310,8 @@ abstract class ApiDocDirective(name: String)
 }
 
 object ApiDocDirective {
-  /** This relies on the naming convention of packages being all-lowercase (which is rarely broken). */
-  def packageDotsToSlash(s: String) = s.replaceAll("(\\b[a-z]+)\\.", "$1/")
+  /** This relies on the naming convention of packages being all-ascii-lowercase (which is rarely broken), numbers and underscore. */
+  def packageDotsToSlash(s: String) = s.replaceAll("(\\b[a-z][a-z0-9_]*)\\.", "$1/")
 }
 
 case class ScaladocDirective(ctx: Writer.Context)
diff --git a/tests/src/test/scala/com/lightbend/paradox/markdown/ScaladocDirectiveSpec.scala b/tests/src/test/scala/com/lightbend/paradox/markdown/ScaladocDirectiveSpec.scala
index 4123f6bd..ec9ab1e6 100644
--- a/tests/src/test/scala/com/lightbend/paradox/markdown/ScaladocDirectiveSpec.scala
+++ b/tests/src/test/scala/com/lightbend/paradox/markdown/ScaladocDirectiveSpec.scala
@@ -35,6 +35,11 @@ class ScaladocDirectiveSpec extends MarkdownBaseSpec {
       html("""<p><a href="http://example.org/api/0.1.2/org/example/Model.html" title="org.example.Model"><code>Model</code></a></p>""")
   }
 
+  it should "create accept digits in package names" in {
+    markdown("@scaladoc[ObjectMetadata](akka.s3.ObjectMetadata)") shouldEqual
+      html("""<p><a href="http://doc.akka.io/api/akka/2.4.10/akka/s3/ObjectMetadata.html" title="akka.s3.ObjectMetadata"><code>ObjectMetadata</code></a></p>""")
+  }
+
   it should "support 'scaladoc:' as an alternative name" in {
     markdown("@scaladoc:[Model](org.example.Model)") shouldEqual
       html("""<p><a href="http://example.org/api/0.1.2/org/example/Model.html" title="org.example.Model"><code>Model</code></a></p>""")