diff --git a/loaih/build.py b/loaih/build.py
index 0846dc3..6a8d479 100644
--- a/loaih/build.py
+++ b/loaih/build.py
@@ -390,16 +390,12 @@ class Build(loaih.RemoteBuild):
     def __create_checksum__(self, file):
         """Internal function to create checksum file."""
 
-        checksum = hashlib.md5()
-        fullpath = os.path.join(self.appnamedir, file)
+        checksum = subprocess.run(shlex.split(f"md5sum {file}"),
+            capture_output=True, text=True, encoding='utf-8', check=True)
 
-        if os.path.exists(fullpath):
-            with open(os.path.join(self.appnamedir, file), 'rb') as readfile:
-                for chunk in iter(lambda: readfile.read(4096), b""):
-                    checksum.update(chunk)
-
-            with open(f"{file}.md5", 'w', encoding='utf-8') as csfile:
-                csfile.write(checksum.hexdigest())
+        if checksum.stdout:
+            with open(f"{file}.md5", 'w', encoding='utf-8') as checkfile:
+                checkfile.write(checksum.stdout)
 
 
     def publish(self):