diff --git a/quisp/channels/FreeSpaceChannel_test.cc b/quisp/channels/FreeSpaceChannel_test.cc
index c4088eb04..5368b9dff 100644
--- a/quisp/channels/FreeSpaceChannel_test.cc
+++ b/quisp/channels/FreeSpaceChannel_test.cc
@@ -30,13 +30,13 @@ class MockNode : public quisp_test::TestQNode {
 class FreeSpaceChannel : public OriginalFreeSpaceChannel {
  public:
   FreeSpaceChannel() : OriginalFreeSpaceChannel::FreeSpaceChannel() {
-    setParDouble(this, "distance", 0);
+    setParDouble(this, "distance", 0, "km");
     setParDouble(this, "delay", 0);
     setParDouble(this, "datarate", 0);
     setParDouble(this, "ber", 0);
     setParDouble(this, "per", 0);
     setParDouble(this, "orbital_period", 86400);
-    setParDouble(this, "speed_of_light_in_freespace", 299792458);
+    setParDouble(this, "speed_of_light_in_freespace", 299792.458, "km");
     setParBool(this, "disabled", false);
     setParBool(this, "csv_varies_delay", true);
 
diff --git a/quisp/test_utils/TestUtilFunctions.cc b/quisp/test_utils/TestUtilFunctions.cc
index 2c632062e..813793e65 100644
--- a/quisp/test_utils/TestUtilFunctions.cc
+++ b/quisp/test_utils/TestUtilFunctions.cc
@@ -34,6 +34,19 @@ void setParDouble(cModule *module, const char *name, const double val) {
   module->addPar(p);
 }
 
+void setParDouble(cModule *module, const char *name, const double val, const char *unit) {
+  if (module->findPar(name) != -1) {
+    module->par(name) = val;
+    return;
+  }
+  cParImpl *p = new cDoubleParImpl();
+  p->setName(name);
+  p->setDoubleValue(val);
+  p->setUnit(unit);
+  p->setIsMutable(true);
+  module->addPar(p);
+}
+
 void setParStr(cModule *module, const char *name, const char *val) {
   if (module->findPar(name) != -1) {
     module->par(name) = val;
@@ -94,6 +107,19 @@ void setParDouble(cChannel *channel, const char *name, const double val) {
   channel->addPar(p);
 }
 
+void setParDouble(cChannel *channel, const char *name, const double val, const char *unit) {
+  if (channel->findPar(name) != -1) {
+    channel->par(name) = val;
+    return;
+  }
+  cParImpl *p = new cDoubleParImpl();
+  p->setName(name);
+  p->setDoubleValue(val);
+  p->setUnit(unit);
+  p->setIsMutable(true);
+  channel->addPar(p);
+}
+
 void setParStr(cChannel *channel, const char *name, const char *val) {
   if (channel->findPar(name) != -1) {
     channel->par(name) = val;
diff --git a/quisp/test_utils/TestUtilFunctions.h b/quisp/test_utils/TestUtilFunctions.h
index ff7ba92b2..67574cfb9 100644
--- a/quisp/test_utils/TestUtilFunctions.h
+++ b/quisp/test_utils/TestUtilFunctions.h
@@ -13,11 +13,13 @@ using quisp_test::simulation::TestSimulation;
 
 void setParInt(cModule *module, const char *name, const int val);
 void setParDouble(cModule *module, const char *name, const double val);
+void setParDouble(cModule *module, const char *name, const double val, const char *unit);
 void setParBool(cModule *module, const char *name, const bool val);
 void setParStr(cModule *module, const char *name, const char *val);
 void setParObject(cModule *module, const char *name, omnetpp::cObject *val);
 void setParInt(cChannel *channel, const char *name, const int val);
 void setParDouble(cChannel *channel, const char *name, const double val);
+void setParDouble(cChannel *channel, const char *name, const double val, const char *unit);
 void setParBool(cChannel *channel, const char *name, const bool val);
 void setParStr(cChannel *channel, const char *name, const char *val);
 void setParObject(cChannel *channel, const char *name, omnetpp::cObject *val);