diff --git a/test/unit/hwclock.c b/test/unit/hwclock.c
index 51e41ec..5b2406a 100644
--- a/test/unit/hwclock.c
+++ b/test/unit/hwclock.c
@@ -68,5 +68,7 @@ test_unit(void)
     }
   }
 
+  HCL_DestroyInstance(clock);
+
   LCL_Finalise();
 }
diff --git a/test/unit/ntp_core.c b/test/unit/ntp_core.c
index 89ecd4a..40ca03b 100644
--- a/test/unit/ntp_core.c
+++ b/test/unit/ntp_core.c
@@ -295,4 +295,5 @@ test_unit(void)
   SCH_Finalise();
   LCL_Finalise();
   CNF_Finalise();
+  HSH_Finalise();
 }
diff --git a/test/unit/ntp_sources.c b/test/unit/ntp_sources.c
index 40df9d3..f55612d 100644
--- a/test/unit/ntp_sources.c
+++ b/test/unit/ntp_sources.c
@@ -96,4 +96,5 @@ test_unit(void)
   SCH_Finalise();
   LCL_Finalise();
   CNF_Finalise();
+  HSH_Finalise();
 }
diff --git a/test/unit/sources.c b/test/unit/sources.c
index f166dfd..08ee20c 100644
--- a/test/unit/sources.c
+++ b/test/unit/sources.c
@@ -134,4 +134,5 @@ test_unit(void)
   SCH_Finalise();
   LCL_Finalise();
   CNF_Finalise();
+  HSH_Finalise();
 }