diff --git a/tests/integration/pipe-loopback-shmem.sh b/tests/integration/pipe-loopback-shmem.sh
index 148874625..3111b547d 100755
--- a/tests/integration/pipe-loopback-shmem.sh
+++ b/tests/integration/pipe-loopback-shmem.sh
@@ -27,10 +27,10 @@ INPUT_FILE=$(mktemp)
 OUTPUT_FILE=$(mktemp)
 
 NUM_SAMPLES=${NUM_SAMPLES:-10}
+SIGNAL_COUNT=${SIGNAL_COUNT:-10}
 
 for MODE in polling pthread; do
-for VECTORIZE in 1 5 25; do
-for SIGNAL_COUNT in 1 10 100; do
+for VECTORIZE in 1 5; do
 
 cat > ${CONFIG_FILE} << EOF
 {
@@ -72,7 +72,7 @@ else
 	echo "=========== Sub-test succeeded for: mode=${MODE}, vectorize=${VECTORIZE}, SIGNAL_COUNT=${SIGNAL_COUNT}"
 fi
 
-done; done; done
+done; done;
 
 rm ${OUTPUT_FILE} ${INPUT_FILE} ${CONFIG_FILE}
 
diff --git a/tests/integration/pipe-loopback-socket.sh b/tests/integration/pipe-loopback-socket.sh
index a2a1a4722..37deffb40 100755
--- a/tests/integration/pipe-loopback-socket.sh
+++ b/tests/integration/pipe-loopback-socket.sh
@@ -29,11 +29,11 @@ THEORIES=$(mktemp)
 
 NUM_SAMPLES=${NUM_SAMPLES:-100}
 NUM_VALUES=${NUM_VALUES:-4}
+FORMAT=${FORMAT:-villas.binary}
 
 # Generate test data
 villas signal -v ${NUM_VALUES} -l ${NUM_SAMPLES} -n random > ${INPUT_FILE}
 
-for FORMAT in villas.human gtnet.fake protobuf; do
 for LAYER in udp ip eth unix; do
 	
 VECTORIZES="1"
@@ -119,7 +119,7 @@ else
 	echo "=========== Sub-test succeeded for: format=${FORMAT}, layer=${LAYER}, vectorize=${VECTORIZE}"
 fi
 
-done; done; done
+done; done
 
 rm ${OUTPUT_FILE} ${INPUT_FILE} ${CONFIG_FILE} ${THEORIES}