diff --git a/envi/envi.h b/envi/envi.h
index 4836e94..8dc7977 100644
--- a/envi/envi.h
+++ b/envi/envi.h
@@ -541,7 +541,15 @@ public:
 
 		}
 		return false;
+	}
+
+	bool band_index(void* ptr, unsigned int b){
+		if(header.interleave == envi_header::BSQ){		//if the infile is bsq file
+			if(header.data_type ==envi_header::float32)
+				return ((bsq<float>*)file)->band_index((float*)ptr, b);
 
+		}
+		return false;
 	}
 
 
--
libgit2 0.21.4