diff --git a/sbt-twirl/src/main/scala/play/twirl/sbt/SbtTwirl.scala b/sbt-twirl/src/main/scala/play/twirl/sbt/SbtTwirl.scala
index ec28f47f..57ae4398 100644
--- a/sbt-twirl/src/main/scala/play/twirl/sbt/SbtTwirl.scala
+++ b/sbt-twirl/src/main/scala/play/twirl/sbt/SbtTwirl.scala
@@ -13,6 +13,7 @@ object Import {
   object TwirlKeys {
     val twirlVersion = SettingKey[String]("twirl-version", "Twirl version used for twirl-api dependency")
     val templateFormats = SettingKey[Map[String, String]]("twirl-template-formats", "Defined twirl template formats")
+    val formatFallback = SettingKey[Option[String]]("twirl-format-fallback", "Defined twirl template format fallback for extension")
     val templateImports = SettingKey[Seq[String]]("twirl-template-imports", "Extra imports for twirl templates")
     val constructorAnnotations = SettingKey[Seq[String]]("twirl-constructor-annotations", "Annotations added to constructors in injectable templates")
     @deprecated("No longer supported", "1.2.0")
@@ -64,6 +65,7 @@ object SbtTwirl extends AutoPlugin {
 
   def defaultSettings: Seq[Setting[_]] = Seq(
     templateFormats := defaultFormats,
+    formatFallback := None,
     templateImports := TwirlCompiler.DefaultImports,
     constructorAnnotations := Nil,
     sourceEncoding := scalacEncoding(scalacOptions.value)
@@ -98,6 +100,7 @@ object SbtTwirl extends AutoPlugin {
       (sourceDirectories in compileTemplates).value,
       (target in compileTemplates).value,
       templateFormats.value,
+      formatFallback.value,
       templateImports.value,
       constructorAnnotations.value,
       (includeFilter in compileTemplates).value,
diff --git a/sbt-twirl/src/main/scala/play/twirl/sbt/TemplateCompiler.scala b/sbt-twirl/src/main/scala/play/twirl/sbt/TemplateCompiler.scala
index 4eae4262..fccd3751 100644
--- a/sbt-twirl/src/main/scala/play/twirl/sbt/TemplateCompiler.scala
+++ b/sbt-twirl/src/main/scala/play/twirl/sbt/TemplateCompiler.scala
@@ -19,13 +19,14 @@ object TemplateCompiler {
     codec: Codec,
     useOldParser: Boolean,
     log: Logger): Seq[File] =
-    compile(sourceDirectories, targetDirectory, templateFormats, templateImports, Nil, includeFilter, excludeFilter,
-      codec,  log)
+    compile(sourceDirectories, targetDirectory, templateFormats, None, templateImports, Nil, includeFilter, excludeFilter,
+      codec, log)
 
   def compile(
     sourceDirectories: Seq[File],
     targetDirectory: File,
     templateFormats: Map[String, String],
+    formatFallback: Option[String],
     templateImports: Seq[String],
     constructorAnnotations: Seq[String],
     includeFilter: FileFilter,
@@ -35,7 +36,7 @@ object TemplateCompiler {
 
     try {
       syncGenerated(targetDirectory, codec)
-      val templates = collectTemplates(sourceDirectories, templateFormats, includeFilter, excludeFilter)
+      val templates = collectTemplates(sourceDirectories, templateFormats, formatFallback, includeFilter, excludeFilter)
       for ((template, sourceDirectory, extension, format) <- templates) {
         val imports = formatImports(templateImports, extension)
         TwirlCompiler.compile(template, sourceDirectory, targetDirectory, format, imports, constructorAnnotations,
@@ -53,14 +54,24 @@ object TemplateCompiler {
     generatedFiles(targetDirectory).map(GeneratedSource(_, codec)).foreach(_.sync)
   }
 
-  def collectTemplates(sourceDirectories: Seq[File], templateFormats: Map[String, String], includeFilter: FileFilter, excludeFilter: FileFilter): Seq[(File, File, String, String)] = {
+  def collectTemplates(
+    sourceDirectories: Seq[File],
+    templateFormats: Map[String, String],
+    formatFallback: Option[String],
+    includeFilter: FileFilter,
+    excludeFilter: FileFilter): Seq[(File, File, String, String)] = {
+
     sourceDirectories flatMap { sourceDirectory =>
       (sourceDirectory ** includeFilter).get flatMap { file =>
         val ext = file.name.split('.').last
-        if (!excludeFilter.accept(file) && templateFormats.contains(ext))
-          Some((file, sourceDirectory, ext, templateFormats(ext)))
-        else
+
+        if (!excludeFilter.accept(file)) {
+          templateFormats.get(ext).orElse(formatFallback).map { format =>
+            (file, sourceDirectory, ext, format)
+          }
+        } else {
           None
+        }
       }
     }
   }
diff --git a/sbt-twirl/src/sbt-test/twirl/compile/build.sbt b/sbt-twirl/src/sbt-test/twirl/compile/build.sbt
index 2208e4b2..4a4706ce 100644
--- a/sbt-twirl/src/sbt-test/twirl/compile/build.sbt
+++ b/sbt-twirl/src/sbt-test/twirl/compile/build.sbt
@@ -1 +1,3 @@
-lazy val root = (project in file(".")).enablePlugins(SbtTwirl)
+lazy val root = (project in file("."))
+  .enablePlugins(SbtTwirl)
+  .settings(TwirlKeys.formatFallback := Some("play.twirl.api.HtmlFormat"))
diff --git a/sbt-twirl/src/sbt-test/twirl/compile/src/test/scala/test/Test.scala b/sbt-twirl/src/sbt-test/twirl/compile/src/test/scala/test/Test.scala
index fb6b8cdd..1d6d7c1e 100644
--- a/sbt-twirl/src/sbt-test/twirl/compile/src/test/scala/test/Test.scala
+++ b/sbt-twirl/src/sbt-test/twirl/compile/src/test/scala/test/Test.scala
@@ -10,4 +10,6 @@ object Test extends App {
   test(a.b.html.c.render("world"), "\nHello, world.\n")
 
   test(html.template.render("42"), "\nAnswer: 42\n")
+
+  test(conf.template.render("42"), "\nConf: 42\n")
 }