--- a/printrun-src/printrun/power/osx.py	Tue Jan 19 20:45:09 2021 +0100
+++ b/printrun-src/printrun/power/osx.py	Wed Jan 20 10:15:13 2021 +0100
@@ -41,6 +41,7 @@
         encoding = CoreFoundation.kCFStringEncodingASCII
     except AttributeError:
         encoding = 0x600
+    string = string.encode('ascii')
     cfstring = CoreFoundation.CFStringCreateWithCString(None, string, encoding)
     return objc.pyobjc_id(cfstring.nsstring())