diff --git a/util/collection/src/main/scala/sbt/Util.scala b/util/collection/src/main/scala/sbt/Util.scala
index f4f6fbb50..27b32dd87 100644
--- a/util/collection/src/main/scala/sbt/Util.scala
+++ b/util/collection/src/main/scala/sbt/Util.scala
@@ -3,6 +3,8 @@
  */
 package sbt
 
+import java.util.Locale
+
 object Util
 {
 	def makeList[T](size: Int, value: T): List[T] = List.fill(size)(value)
@@ -31,13 +33,13 @@ object Util
 	def hypenToCamel(s: String): String = hyphenToCamel(s)
 	def hyphenToCamel(s: String): String =
 		if(hasHyphen(s))
-			Hypen.replaceAllIn(s, _.group(1).toUpperCase)
+			Hypen.replaceAllIn(s, _.group(1).toUpperCase(Locale.ENGLISH))
 		else
 			s
 
 	private[this] lazy val Camel = """(\p{javaLowerCase})(\p{javaUpperCase})""".r
 	def camelToHypen(s: String): String =
-		Camel.replaceAllIn(s, m => m.group(1) + "-" + m.group(2).toLowerCase)
+		Camel.replaceAllIn(s, m => m.group(1) + "-" + m.group(2).toLowerCase(Locale.ENGLISH))
 
 	def quoteIfKeyword(s: String): String = if(ScalaKeywords.values(s)) '`' + s + '`' else s
 }
diff --git a/util/log/src/main/scala/sbt/ConsoleLogger.scala b/util/log/src/main/scala/sbt/ConsoleLogger.scala
index 6fefc890a..e5c8f040f 100644
--- a/util/log/src/main/scala/sbt/ConsoleLogger.scala
+++ b/util/log/src/main/scala/sbt/ConsoleLogger.scala
@@ -3,7 +3,8 @@
  */
 package sbt
 
-	import java.io.{BufferedWriter, PrintStream, PrintWriter}
+import java.io.{BufferedWriter, PrintStream, PrintWriter}
+import java.util.Locale
 
 object ConsoleLogger
 {
@@ -99,7 +100,7 @@ object ConsoleLogger
 	val noSuppressedMessage = (_: SuppressedTraceContext) => None
 
 	private[this] def os = System.getProperty("os.name")
-	private[this] def isWindows = os.toLowerCase.indexOf("windows") >= 0
+	private[this] def isWindows = os.toLowerCase(Locale.ENGLISH).indexOf("windows") >= 0
 	
 	def apply(out: PrintStream): ConsoleLogger = apply(ConsoleOut.printStreamOut(out))
 	def apply(out: PrintWriter): ConsoleLogger = apply(ConsoleOut.printWriterOut(out))