diff --git a/src/lib/sprite.c b/src/lib/sprite.c
index d923c2016..57ecd7c11 100644
--- a/src/lib/sprite.c
+++ b/src/lib/sprite.c
@@ -158,9 +158,11 @@ int sprixel_load(sprixel* spx, fbuf* f, int pixy, int pixx,
   assert(spx->n);
   if(spx->cellpxy > 0){ // don't explode on ncdirect case
     if((pixy + spx->cellpxy - 1) / spx->cellpxy != spx->dimy){
+      logerror("bad pixy %d (cellpxy %d dimy %d)\n", pixy, spx->cellpxy, spx->dimy);
       return -1;
     }
     if((pixx + spx->cellpxx - 1) / spx->cellpxx != spx->dimx){
+      logerror("bad pixx %d (cellpxx %d dimx %d)\n", pixx, spx->cellpxx, spx->dimx);
       return -1;
     }
   }