diff --git a/stim/envi/envi_header.h b/stim/envi/envi_header.h
index 1be4705..3b4fb4b 100644
--- a/stim/envi/envi_header.h
+++ b/stim/envi/envi_header.h
@@ -315,6 +315,12 @@ struct envi_header
             exit(1);
         }
 
+		if(wavelength.size() == 0){											//if no list of wavelengths is given, create one based on band numbers
+			wavelength.resize(bands);
+			for(size_t b = 0; b < bands; b++)
+				wavelength[b] = (double)b;
+		}
+
 		//close the file
 		file.close();
 
--
libgit2 0.21.4