diff --git a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/tools/ExtractAlignedFastq.scala b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/tools/ExtractAlignedFastq.scala
index 0b569d6c40714ffda03ddbd2390342601630d1d3..6f51b5e1ae14a2f710f012af9b0681ab75bf0d0c 100644
--- a/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/tools/ExtractAlignedFastq.scala
+++ b/public/biopet-framework/src/main/scala/nl/lumc/sasc/biopet/tools/ExtractAlignedFastq.scala
@@ -60,7 +60,7 @@ object ExtractAlignedFastq extends ToolCommand {
       case ptn2(chr, start) =>
         val startCoord = intFromCoord(start)
         new Interval(chr, startCoord, startCoord)
-      case _ => throw new IllegalArgumentException("Invalid interval string: " + x)
+      case otherwise => throw new IllegalArgumentException("Invalid interval string: " + otherwise)
     }.toIterator
   }