diff --git a/mapping/src/main/scala/nl/lumc/sasc/biopet/pipelines/mapping/Mapping.scala b/mapping/src/main/scala/nl/lumc/sasc/biopet/pipelines/mapping/Mapping.scala
index 387371b813cf200f0db7708bf4bcce25029ce502..79dfb14a8d4870c530b47f85300c7bc0e49e6a2d 100644
--- a/mapping/src/main/scala/nl/lumc/sasc/biopet/pipelines/mapping/Mapping.scala
+++ b/mapping/src/main/scala/nl/lumc/sasc/biopet/pipelines/mapping/Mapping.scala
@@ -178,7 +178,7 @@ class Mapping(val root: Configurable) extends QScript with SummaryQScript with S
         }
       }
       logger.debug("Chunks: " + numberChunks.getOrElse(1))
-      if (numberChunks.getOrElse(1) > 1) chunking = false
+      if (numberChunks.getOrElse(1) <= 1) chunking = false
     }
   }