diff --git a/variants/svcalling.sh b/variants/svcalling.sh
index 28812c1394dde759fb6e4b779f1fb49305d7f237..be79e49f437762ffd939f4b7a5b89d8dcbd6b150 100755
--- a/variants/svcalling.sh
+++ b/variants/svcalling.sh
@@ -64,7 +64,7 @@ mkdir -p temp
 
 if [[ -z $tid ]]
 then
-    tid=`samtools view -H ${sbam} |grep '^@RG' |perl -pi -e 's/\t/\n/g' |grep ID |cut -f 2 -d ':'`
+    tid=`samtools view -H ${sbam} |grep '^@RG' |perl -pe 's/\t/\n/g' |grep ID |cut -f 2 -d ':'`
 fi
 
 bams=''