X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fio%2FStructureFile.java;h=3025907fe46adc023add9e13001dddebcf85dae2;hb=refs%2Fheads%2Ffeatures%2FJAL-2446NCList;hp=40bb8bee96a75f0317f1001c0317e999a469e3c5;hpb=e327ac5df98f528afeb347ac9a79085ad0d0975b;p=jalview.git

diff --git a/src/jalview/io/StructureFile.java b/src/jalview/io/StructureFile.java
index 40bb8be..3025907 100644
--- a/src/jalview/io/StructureFile.java
+++ b/src/jalview/io/StructureFile.java
@@ -397,8 +397,10 @@ public abstract class StructureFile extends AlignFile
 
   public static boolean isRNA(SequenceI seq)
   {
-    for (char c : seq.getSequence())
+    int length = seq.getLength();
+    for (int i = 0; i < length; i++)
     {
+      char c = seq.getCharAt(i);
       if ((c != 'A') && (c != 'C') && (c != 'G') && (c != 'U'))
       {
         return false;