Index: src/main/java/it/geosolutions/imageio/plugins/arcgrid/raster/AsciiGridRaster.java
===================================================================
--- src/main/java/it/geosolutions/imageio/plugins/arcgrid/raster/AsciiGridRaster.java	(revision 1014)
+++ src/main/java/it/geosolutions/imageio/plugins/arcgrid/raster/AsciiGridRaster.java	(working copy)
@@ -575,7 +575,7 @@
 				// Case 1: Exact key
 				if (markedPos != null) {
 
-					imageIS.seek(markedPos.intValue());
+					imageIS.seek(markedPos.longValue());
 					samplesCounted = samplesToThrowAwayBeforeFirstValidSample;
 
 					// I have found a stream Position associated to the number