diff --git a/src/fs.rs b/src/fs.rs
index cdf80fd..837a550 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -211,13 +211,13 @@ mod tests {
 
     #[test]
     fn file_len() {
-        let file = RefCell::new(File::open("ext2.bin").unwrap());
+        let file = RefCell::new(File::open("ext2.img").unwrap());
         assert_eq!(unsafe { file.slice_unchecked(1024..2048).len() }, 1024);
     }
 
     #[test]
     fn file() {
-        let file = RefCell::new(File::open("ext2.bin").unwrap());
+        let file = RefCell::new(File::open("ext2.img").unwrap());
         let fs = Ext2::new(file);
 
         assert!(
@@ -235,7 +235,7 @@ mod tests {
 
     #[test]
     fn inodes() {
-        let file = RefCell::new(File::open("ext2.bin").unwrap());
+        let file = RefCell::new(File::open("ext2.img").unwrap());
         let fs = Ext2::new(file);
 
         assert!(
diff --git a/src/sys/superblock.rs b/src/sys/superblock.rs
index e1ab61d..77cb82a 100644
--- a/src/sys/superblock.rs
+++ b/src/sys/superblock.rs
@@ -313,7 +313,7 @@ mod tests {
         use std::cell::RefCell;
         use std::fs::File;
 
-        let file = RefCell::new(File::open("ext2.bin").unwrap());
+        let file = RefCell::new(File::open("ext2.img").unwrap());
         let superblock = unsafe { Superblock::find(&file) };
         assert!(
             superblock.is_ok(),