Signed-off-by: Alex Bennée <alex.ben...@linaro.org>

diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index 417b0cdce13..29613afd489 100755
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -111,7 +111,7 @@ def _get_so_libs(executable):
     libs = []
     ldd_re = re.compile(r"(/.*/)(\S*)")
     try:
-        ldd_output = subprocess.check_output(["ldd", executable])
+        ldd_output = subprocess.check_output(["ldd", 
executable]).decode('utf-8')
         for line in ldd_output.split("\n"):
             search = ldd_re.search(line)
             if search and len(search.groups()) == 2:
-- 
2.20.1


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