diff --git a/espflash/src/image_format/esp32bootloader.rs b/espflash/src/image_format/esp32bootloader.rs
index 132789a2..be0e4dfc 100644
--- a/espflash/src/image_format/esp32bootloader.rs
+++ b/espflash/src/image_format/esp32bootloader.rs
@@ -180,7 +180,7 @@ impl<'a> Esp32BootloaderFormat<'a> {
         let perc =  data.len() as f32 / part.size as f32 * 100.0;
         println!("App/part. size:    {}/{} bytes, {:.2}%",  data.len(), part.size,perc);
 
-        if perc >= 1f32 {
+        if perc > 100.0 {
             return Err(Error::ElfTooBig);
         }