diff --git a/modules/Bio/EnsEMBL/Transcript.pm b/modules/Bio/EnsEMBL/Transcript.pm
index 4974e63c967a38ceb47210cd266ff70eb731d107..7aedfaa5aea99329aaf8ab97a93ce20bd169fa55 100755
--- a/modules/Bio/EnsEMBL/Transcript.pm
+++ b/modules/Bio/EnsEMBL/Transcript.pm
@@ -1306,6 +1306,10 @@ sub add_Exon {
               # Overlap
               last;
             }
+            if ( $i and $exon_start <= $ea->[$i-1]->end() ) {
+              # Overlap
+              last;
+            }
             splice( @{$ea}, $i, 0, $exon );
             $was_added = 1;
             last;
@@ -1332,6 +1336,10 @@ sub add_Exon {
               # Overlap
               last;
             }
+            if ( $i and $exon_end >= $ea->[$i-1]->start() ) {
+              # Overlap
+              last;
+            }
             splice( @{$ea}, $i, 0, $exon );
             $was_added = 1;
             last;