diff --git a/compile/src/test/scala/sbt/compiler/javac/javaErrorParserSpec.scala b/compile/src/test/scala/sbt/compiler/javac/javaErrorParserSpec.scala
index b7e088b2e..6bd035658 100644
--- a/compile/src/test/scala/sbt/compiler/javac/javaErrorParserSpec.scala
+++ b/compile/src/test/scala/sbt/compiler/javac/javaErrorParserSpec.scala
@@ -18,7 +18,7 @@ object JavaErrorParserSpec extends Specification {
      be able to parse javac errors $parseSampleJavac
   """
 
-  def parseSampleLinux = {
+  def parseSampleLinux: MatchResult[_] = {
     val parser = new JavaErrorParser()
     val logger = Logger.Null
     val problems = parser.parseProblems(sampleLinuxMessage, logger)
@@ -27,7 +27,7 @@ object JavaErrorParserSpec extends Specification {
     rightSize and rightFile
   }
 
-  def parseSampleWindows = {
+  def parseSampleWindows: MatchResult[_] = {
     val parser = new JavaErrorParser()
     val logger = Logger.Null
     val problems = parser.parseProblems(sampleWindowsMessage, logger)
@@ -46,7 +46,7 @@ object JavaErrorParserSpec extends Specification {
     }
   }
 
-  def parseSampleJavac = {
+  def parseSampleJavac: MatchResult[_] = {
     val parser = new JavaErrorParser()
     val logger = Logger.Null
     val problems = parser.parseProblems(sampleJavacMessage, logger)
@@ -55,7 +55,7 @@ object JavaErrorParserSpec extends Specification {
     rightSize and rightError
   }
 
-  def sampleLinuxMessage =
+  def sampleLinuxMessage: String =
     """
       |/home/me/projects/sample/src/main/Test.java:4: cannot find symbol
       |symbol  : method baz()
@@ -63,7 +63,7 @@ object JavaErrorParserSpec extends Specification {
       |return baz();
     """.stripMargin
 
-  def sampleWindowsMessage =
+  def sampleWindowsMessage: String =
     s"""
       |$windowsFile:4: cannot find symbol
       |symbol  : method baz()
@@ -71,8 +71,8 @@ object JavaErrorParserSpec extends Specification {
       |return baz();
     """.stripMargin
 
-  def windowsFile = """C:\Projects\sample\src\main\java\Test.java"""
-  def windowsFileAndLine = s"""$windowsFile:4"""
+  def windowsFile: String = """C:\Projects\sample\src\main\java\Test.java"""
+  def windowsFileAndLine: String = s"""$windowsFile:4"""
 
   def sampleJavacMessage = "javac: invalid flag: -foobar"
 }