diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 15a55046db9..426fbe61d92 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -3822,27 +3822,27 @@ module ts {
                     }
                     else {
                         var matchResult = fullTripleSlashReferencePathRegEx.exec(comment);
-			var start = range.pos;
-			var end = range.end;
+                        var start = range.pos;
+                        var end = range.end;
                         var length = end - start;
-
+                        
                         if (!matchResult) {
                             errorAtPos(start, length, Diagnostics.Invalid_reference_directive_syntax);
                         }
                         else {
-		            var referenceFilename = matchResult[3];
+                            var referenceFilename = matchResult[3];
                             var basePath = getDirectoryPath(file.filename);
                             var referenceFullPath = normalizePath(combinePaths(basePath, referenceFilename));
-			    if (file.filename.toLocaleLowerCase() === referenceFullPath.toLocaleLowerCase()) {
-			        errorAtPos(start, length, Diagnostics.A_file_cannot_have_a_reference_to_itself);
-			    }
-			    else {
-			        referencedFiles.push({
-			            pos: start,
-			            end: end,
-				    filename: referenceFilename
-			        });
-		            }
+                            if (file.filename.toLocaleLowerCase() === referenceFullPath.toLocaleLowerCase()) {
+                                errorAtPos(start, length, Diagnostics.A_file_cannot_have_a_reference_to_itself);
+                            }
+                            else {
+                                referencedFiles.push({
+                                    pos: start,
+                                    end: end,
+                                    filename: referenceFilename
+                                });
+                            }
                         }
                     }
                 }