diff --git a/src/visp/arch/esrgan.cpp b/src/visp/arch/esrgan.cpp
index 2f55dc8..e77d3a2 100644
--- a/src/visp/arch/esrgan.cpp
+++ b/src/visp/arch/esrgan.cpp
@@ -86,7 +86,7 @@ esrgan_params esrgan_detect_params(model_file const& f) {
     p.scale = f.get_int("esrgan.scale");
     p.n_blocks = f.get_int("esrgan.block_count");
     
-    if (p.scale < 2 || p.scale > 4) {
+    if (p.scale < 1 || p.scale > 8) {
         throw except("ESRGAN: unsupported scale: {}", p.scale);
     }
     if (p.n_blocks < 1 || p.n_blocks > 23) {
@@ -100,4 +100,4 @@ int esrgan_estimate_graph_size(esrgan_params const& p) {
     return 512 + p.n_blocks * 192;
 }
 
-} // namespace visp
\ No newline at end of file
+} // namespace visp