diff --git a/stim/envi/bsq.h b/stim/envi/bsq.h
index 8297e30..387838d 100644
--- a/stim/envi/bsq.h
+++ b/stim/envi/bsq.h
@@ -996,7 +996,7 @@ public:
 					matrix[i*Z() + b] = band_image[xy];			//copy it to the appropriate point in the values[] array
 					i++;
 				}
-				if(PROGRESS) progress = (double)(xy+1) / (double)XY * 100;
+				if(PROGRESS) progress = (double)(b * XY + xy+1) / (double)(XY * Z()) * 100;
 			}
 		}
 
--
libgit2 0.21.4