diff --git a/runtests.sh b/runtests.sh
index 8d72a95b..1c8adc9d 100755
--- a/runtests.sh
+++ b/runtests.sh
@@ -101,9 +101,9 @@ function generate_expected_output()
         echo "A lot of output hidden..."
     else
         (
-            (grep -onH '# Warning: .*' $joufile || true) | sed -E s/'(.*):([0-9]*):# Warning: '/'compiler warning for file "\1", line \2: '/
-            (grep -onH '# Error: .*' $joufile || true) | sed -E s/'(.*):([0-9]*):# Error: '/'compiler error in file "\1", line \2: '/
-            (grep -oE '# Output:.*' $joufile || true) | sed -E s/'^# Output: ?'//
+            (grep --binary-files=text -onH '# Warning: .*' $joufile || true) | sed -E s/'(.*):([0-9]*):# Warning: '/'compiler warning for file "\1", line \2: '/
+            (grep --binary-files=text -onH '# Error: .*' $joufile || true) | sed -E s/'(.*):([0-9]*):# Error: '/'compiler error in file "\1", line \2: '/
+            (grep --binary-files=text -oE '# Output:.*' $joufile || true) | sed -E s/'^# Output: ?'//
         ) | sed "s,<joudir>,$joudir,g" | sed "s,<jouexe>,$jouexe,g"
     fi
     echo "Exit code: $correct_exit_code"
diff --git a/tests/other_errors/source_file_contain_zero_byte.jou b/tests/other_errors/source_file_contain_zero_byte.jou
new file mode 100644
index 00000000..e29ffbcb
Binary files /dev/null and b/tests/other_errors/source_file_contain_zero_byte.jou differ