diff --git a/src/libCom/test/Makefile b/src/libCom/test/Makefile
index 7e1b5a020..fadf89066 100644
--- a/src/libCom/test/Makefile
+++ b/src/libCom/test/Makefile
@@ -70,6 +70,7 @@ TESTS += epicsTimeTest
 
 TESTPROD_HOST += epicsTimeZoneTest
 epicsTimeZoneTest_SRCS += epicsTimeZoneTest.c
+testHarness_SRCS += epicsTimeZoneTest.cpp
 TESTS += epicsTimeZoneTest
 
 TESTPROD_HOST += epicsThreadTest
diff --git a/src/libCom/test/epicsRunLibComTests.c b/src/libCom/test/epicsRunLibComTests.c
index aa62465ff..73a491ae6 100644
--- a/src/libCom/test/epicsRunLibComTests.c
+++ b/src/libCom/test/epicsRunLibComTests.c
@@ -34,6 +34,7 @@ int epicsThreadOnceTest(void);
 int epicsThreadPriorityTest(void);
 int epicsThreadPrivateTest(void);
 int epicsTimeTest(void);
+int epicsTimeZoneTest(void);
 int macLibTest(void);
 int macEnvExpandTest(void);
 int ringPointerTest(void);
@@ -89,6 +90,8 @@ void epicsRunLibComTests(void)
 
     runTest(epicsTimeTest);
 
+    runTest(epicsTimeZoneTest);
+
     runTest(macLibTest);
 
     runTest(macEnvExpandTest);