diff --git a/src/frida/tracer.py b/src/frida/tracer.py
index 0947a92..3fa04a0 100644
--- a/src/frida/tracer.py
+++ b/src/frida/tracer.py
@@ -438,7 +438,7 @@ class Repository(object):
             try:
                 with open(os.devnull, 'w') as devnull:
                     output = subprocess.check_output(["man", "-P", "col -b", "2", function.name], stderr=devnull)
-                match = re.search(r"^SYNOPSIS(?:.|\n)*?((?:^.+$\n)* {5}" + function.name + r"\(.*\n(^.+$\n)*)(?:.|\n)*^DESCRIPTION", output.decode(), re.MULTILINE)
+                match = re.search(r"^SYNOPSIS(?:.|\n)*?((?:^.+$\n)* {5}" + function.name + r"\(.*\n(^.+$\n)*)(?:.|\n)*^DESCRIPTION", output.decode(errors="replace"), re.MULTILINE)
                 if match:
                     decl = match.group(1)
                     for argm in re.finditer(r"([^* ]*)\s*(,|\))", decl):