diff --git a/tools/power/pm-graph/sleepgraph.py b/tools/power/pm-graph/sleepgraph.py
index 82c09cd25cc21..bf4ac24a1c7aa 100755
--- a/tools/power/pm-graph/sleepgraph.py
+++ b/tools/power/pm-graph/sleepgraph.py
@@ -5556,9 +5556,8 @@ def executeSuspend(quiet=False):
 		if not quiet:
 			pprint('CAPTURING TRACE')
 		op = sv.writeDatafileHeader(sv.ftracefile, testdata)
-		fp = open(tp+'trace', 'r')
-		for line in fp:
-			op.write(line)
+		fp = open(tp+'trace', 'rb')
+		op.write(ascii(fp.read()))
 		op.close()
 		sv.fsetVal('', 'trace')
 		sv.platforminfo(cmdafter)