diff --git a/tests/scripts/decode.sh b/tests/scripts/decode.sh
index be5a9c3..8b08373 100755
--- a/tests/scripts/decode.sh
+++ b/tests/scripts/decode.sh
@@ -7,7 +7,7 @@
 export SHORTENED_CAPFILE="tmp.cfile"
 export RESULT_EXPECTED="../fixtures/grgsm_decode_test1_expected"
 export RESULT_OBTAINED="grgsm_decode_test1_result"
-export RUNLINE="$AP_DECODE -c $SHORTENED_CAPFILE -s $((100000000/174)) -m BCCH -t 0 -v "
+export RUNLINE="$AP_DECODE -c $SHORTENED_CAPFILE -s $((100000000/174)) -m BCCH -t 0 -v --ppm -10"
 echo "Testing with:"
 echo "  $RUNLINE"
 gnuradio-companion --version