diff --git a/tests/test_nc1.sh b/tests/test_nc1.sh
index e4467c0..fc6b70d 100755
--- a/tests/test_nc1.sh
+++ b/tests/test_nc1.sh
@@ -1,7 +1,22 @@
 #!/bin/bash
 
+if ! command -v nc > /dev/null 2> /dev/null
+then
+    echo "Skipping nc test, not installed."
+    exit 0
+fi
+
+IS_NC_OPENBSD=$(nc -help 2>&1 | grep -o OpenBSD)
+# These tests only work with netcat-openbsd.
+if [ "$IS_NC_OPENBSD" != "OpenBSD" ]
+then
+    echo "Skipping nc test, wrong version of nc installed."
+    exit 0
+fi
+
 if nc 2>&1 | grep -q apple
 then
+    echo "Skipping nc test, incorrect version of nc installed."
     exit 0
 fi
 
@@ -18,7 +33,7 @@ TESTRESULT="ERROR"
 PORT=$(( $RANDOM % 10000 + 30000 ))
 
 rm -f $TEST/response
-$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "rtlwmbus:CMD(nc -lkv $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
+$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "rtlwmbus:CMD(nc -lkn $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
 
 sleep 0.5
 
diff --git a/tests/test_nc2.sh b/tests/test_nc2.sh
index f126a0f..4df1cdf 100755
--- a/tests/test_nc2.sh
+++ b/tests/test_nc2.sh
@@ -1,7 +1,21 @@
 #!/bin/bash
+if ! command -v nc > /dev/null 2> /dev/null
+then
+    echo "Skipping nc test, not installed."
+    exit 0
+fi
+
+IS_NC_OPENBSD=$(nc -help 2>&1 | grep -o OpenBSD)
+# These tests only work with netcat-openbsd.
+if [ "$IS_NC_OPENBSD" != "OpenBSD" ]
+then
+    echo "Skipping nc test, wrong version of nc installed."
+    exit 0
+fi
 
 if nc 2>&1 | grep -q apple
 then
+    echo "Skipping nc test, incorrect version of nc installed."
     exit 0
 fi
 
@@ -18,7 +32,7 @@ TESTRESULT="ERROR"
 PORT=$(( $RANDOM % 10000 + 30000 ))
 
 rm -f $TEST/response
-$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "hex:CMD(nc -lk $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
+$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "hex:CMD(nc -lkn $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
 
 sleep 0.5
 
diff --git a/tests/test_nc3.sh b/tests/test_nc3.sh
index 73bfcdf..41f6ce9 100755
--- a/tests/test_nc3.sh
+++ b/tests/test_nc3.sh
@@ -1,7 +1,22 @@
 #!/bin/bash
 
+if ! command -v nc > /dev/null 2> /dev/null
+then
+    echo "Skipping nc test, not installed."
+    exit 0
+fi
+
+IS_NC_OPENBSD=$(nc -help 2>&1 | grep -o OpenBSD)
+# These tests only work with netcat-openbsd.
+if [ "$IS_NC_OPENBSD" != "OpenBSD" ]
+then
+    echo "Skipping nc test, wrong version of nc installed."
+    exit 0
+fi
+
 if nc 2>&1 | grep -q apple
 then
+    echo "Skipping nc test, incorrect version of nc installed."
     exit 0
 fi
 
@@ -18,7 +33,7 @@ TESTRESULT="ERROR"
 PORT=$(( $RANDOM % 10000 + 30000 ))
 
 rm -f $TEST/response
-$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "rawtty:CMD(nc -lk $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
+$PROG --silent --oneshot --exitafter=5s --format=fields --selectfields=total_m3 "rawtty:CMD(nc -lkn $PORT)"  MyWater iperl 33225544 NOKEY >> $TEST/response 2>&1 &
 
 sleep 0.5