diff --git a/toolchain.py b/toolchain.py
index 133bac6..fcea038 100755
--- a/toolchain.py
+++ b/toolchain.py
@@ -37,7 +37,7 @@ def shprint(command, *args, **kwargs):
     kwargs["_out_bufsize"] = 1
     kwargs["_err_to_out"] = True
     for line in command(*args, **kwargs):
-        stdout.write(line)
+        stdout.write(line.encode("ascii", "replace").decode())
 
 
 def cache_execution(f):