diff --git a/test_suite/unit_tests/AI/test_TrafficMgr.cxx b/test_suite/unit_tests/AI/test_TrafficMgr.cxx
index 36ff0b8aa..3f7893abc 100644
--- a/test_suite/unit_tests/AI/test_TrafficMgr.cxx
+++ b/test_suite/unit_tests/AI/test_TrafficMgr.cxx
@@ -23,7 +23,6 @@
 
 #include <cstring>
 #include <memory>
-#include <unistd.h>
 
 #include "test_suite/FGTestApi/NavDataCache.hxx"
 #include "test_suite/FGTestApi/TestDataLogger.hxx"
diff --git a/test_suite/unit_tests/Airports/test_airport.cxx b/test_suite/unit_tests/Airports/test_airport.cxx
index d31d321f4..c693bb980 100644
--- a/test_suite/unit_tests/Airports/test_airport.cxx
+++ b/test_suite/unit_tests/Airports/test_airport.cxx
@@ -24,7 +24,6 @@
 #include <iostream>
 #include <cstring>
 #include <memory>
-#include <unistd.h>
 
 #include "test_suite/FGTestApi/NavDataCache.hxx"
 #include "test_suite/FGTestApi/TestDataLogger.hxx"
@@ -71,7 +70,7 @@ void AirportTests::testAirport()
 {
     FGAirportRef departureAirport = FGAirport::getByIdent("YSSY");
     CPPUNIT_ASSERT_EQUAL_MESSAGE("Must have correct id", (std::string)"YSSY", departureAirport->getId());
-    CPPUNIT_ASSERT_EQUAL_MESSAGE("Must have runways", (uint)6, departureAirport->numRunways());
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Must have runways", (unsigned int) 6, departureAirport->numRunways());
     CPPUNIT_ASSERT_EQUAL_MESSAGE("Must have runway 16R", true, departureAirport->hasRunwayWithIdent("16R"));
         
     int length = 3962;
diff --git a/test_suite/unit_tests/Airports/test_runway.cxx b/test_suite/unit_tests/Airports/test_runway.cxx
index 9923dcc8e..d8371f131 100644
--- a/test_suite/unit_tests/Airports/test_runway.cxx
+++ b/test_suite/unit_tests/Airports/test_runway.cxx
@@ -24,7 +24,6 @@
 #include <iostream>
 #include <cstring>
 #include <memory>
-#include <unistd.h>
 
 #include <simgear/math/sg_geodesy.hxx>
 #include <simgear/math/SGGeod.hxx>
diff --git a/test_suite/unit_tests/Autopilot/testPidController.cxx b/test_suite/unit_tests/Autopilot/testPidController.cxx
index 14161ef0d..5ff3ae4a6 100644
--- a/test_suite/unit_tests/Autopilot/testPidController.cxx
+++ b/test_suite/unit_tests/Autopilot/testPidController.cxx
@@ -13,8 +13,6 @@
 #include <simgear/math/sg_random.hxx>
 #include <simgear/props/props_io.hxx>
 
-#include <unistd.h>
-
 // Set up function for each test.
 void PidControllerTests::setUp()
 {
diff --git a/test_suite/unit_tests/Scripting/testNasalSys.cxx b/test_suite/unit_tests/Scripting/testNasalSys.cxx
index cd6a109cc..cf8552197 100644
--- a/test_suite/unit_tests/Scripting/testNasalSys.cxx
+++ b/test_suite/unit_tests/Scripting/testNasalSys.cxx
@@ -147,7 +147,7 @@ void NasalSysTests::testCommands()
     CPPUNIT_ASSERT(ok);
 
     errors = nasalSys->getAndClearErrorList();
-    CPPUNIT_ASSERT_EQUAL(0UL, errors.size());
+    CPPUNIT_ASSERT_EQUAL(0UL, (unsigned long) errors.size());
 
     // should fail, command is removed
     ok = globals->get_commands()->execute("do-foo", args);