diff --git a/cluster.yaml b/cluster.yaml
index 43a7f9684bb46ee56f6476e68c411650e79ee6ac..5fcfc7b35c8074970fe30b6bf107d9523af8696f 100644
--- a/cluster.yaml
+++ b/cluster.yaml
@@ -50,6 +50,9 @@ bed2fasta:
   mem: 16
   h_vmem: 16
 
+bwamap:
+  time: "36:00:00"	
+
 markduplicates:
   mem: 32
   h_vmem: 32
diff --git a/snakecnv/bin/detect_regions_to_exclude.py b/snakecnv/bin/detect_regions_to_exclude.py
index d0c90f58b52fce66d248ec9ea31d72912fe6089e..ab100d76ff1c96ab7a7637cfce5090a5896558af 100755
--- a/snakecnv/bin/detect_regions_to_exclude.py
+++ b/snakecnv/bin/detect_regions_to_exclude.py
@@ -95,8 +95,8 @@ def dump_overcovered_to_bed(overcovered_regions, fout, window_size):
     for chrom, pos in zip(overcovered_regions.chrom,
                           overcovered_regions.pos):
         fout.write("%s\t%d\t%d\n" % (chrom.decode("utf-8"),
-                                     pos - int(window_size/2),
-                                     pos + int(window_size/2)))
+                                     max(0, pos - int(window_size/2) - 200),
+                                     pos + int(window_size/2) + 200))
 
 
 def dump_illcovered_to_bed(overcovered_regions, fout, window_size):