diff --git a/pyro/PexHeader.py b/pyro/PexHeader.py
index 7aaed0b4..87995963 100644
--- a/pyro/PexHeader.py
+++ b/pyro/PexHeader.py
@@ -36,4 +36,7 @@ def read(self, f: IO, name: str, length: int) -> None:
             if isinstance(obj, PexInt):
                 obj.value = int.from_bytes(obj.data, self.endianness, signed=False)
             elif isinstance(obj, PexStr):
-                obj.value = obj.data.decode('ascii')
+                try:
+                    obj.value = obj.data.decode('ascii')
+                except UnicodeDecodeError:
+                    obj.value = obj.data.decode('utf-8')