diff --git a/tests/integration/pipe-loopback-socket.sh b/tests/integration/pipe-loopback-socket.sh
index 24d8f9a19..8eccb1c59 100755
--- a/tests/integration/pipe-loopback-socket.sh
+++ b/tests/integration/pipe-loopback-socket.sh
@@ -32,9 +32,10 @@ OUTPUT_FILE=$(mktemp)
 THEORIES=$(mktemp)
 
 NUM_SAMPLES=${NUM_SAMPLES:-100}
+NUM_VALUES=${NUM_VALUES:-4}
 
 # Generate test data
-villas-signal random -l ${NUM_SAMPLES} -n > ${INPUT_FILE}
+villas-signal random -v ${NUM_VALUES} -l ${NUM_SAMPLES} -n > ${INPUT_FILE}
 
 for FORMAT in villas-human villas-binary villas-web csv json gtnet-fake raw-flt32 protobuf; do
 for LAYER in udp ip eth unix; do