diff --git a/jpos/src/test/java/org/jpos/space/TSpaceTestCase.java b/jpos/src/test/java/org/jpos/space/TSpaceTestCase.java
index c51cda0e32..6b71681e77 100644
--- a/jpos/src/test/java/org/jpos/space/TSpaceTestCase.java
+++ b/jpos/src/test/java/org/jpos/space/TSpaceTestCase.java
@@ -79,7 +79,7 @@ public void testExpiration() {
         sp.out("testExpiration_Key", "ABC", 50);
         assertEquals("ABC", sp.rdp("testExpiration_Key"));
         try {
-            Thread.sleep(60);
+            Thread.sleep(75); // allow for low system timer accuracy
         } catch (InterruptedException e) {
         }
         assertNull(sp.rdp("testExpiration_Key"), "ABC");
@@ -136,7 +136,7 @@ public void testGC() throws Exception {
         sp.out("testGC_Key", "XYZ", 50);
         assertEquals("ABC", sp.rdp("testGC_Key"));
         try {
-            Thread.sleep(60);
+            Thread.sleep(75); // allow for low system timer accuracy
         } catch (InterruptedException e) {
         }
         assertEquals("testGC_Key", sp.getKeysAsString());
diff --git a/jpos/src/test/java/org/jpos/util/ThroughputControlTestCase.java b/jpos/src/test/java/org/jpos/util/ThroughputControlTestCase.java
index 90972e12bf..bd432dd882 100644
--- a/jpos/src/test/java/org/jpos/util/ThroughputControlTestCase.java
+++ b/jpos/src/test/java/org/jpos/util/ThroughputControlTestCase.java
@@ -32,23 +32,24 @@ public void testSingleThread () throws Exception {
         ThroughputControl tc = new ThroughputControl (2, 1000);
         Instant start = Instant.now();
         assertTrue (tc.control() == 0L, "Control should return 0L");
+        // Allow for low system timer accuracy via a tolerance of 25 milliseconds either way:
         assertTrue (
-                Duration.between(start, Instant.now()).toMillis() < 1000L,
+                Duration.between(start, Instant.now()).toMillis() < 1000L + 25L,
                 "Elapsed time should be less than one second"
         );
         tc.control();
         assertTrue (
-                Duration.between(start, Instant.now()).toMillis() < 1000L,
+                Duration.between(start, Instant.now()).toMillis() < 1000L + 25L,
                 "Elapsed time should still be less than one second"
         );
         tc.control();
         assertTrue (
-                Duration.between(start, Instant.now()).toMillis() > 1000L,
+                Duration.between(start, Instant.now()).toMillis() > 1000L - 25L,
                 "Elapsed time should be greater than one second"
         );
         tc.control();
         assertTrue (
-                Duration.between(start, Instant.now()).toMillis() < 2000L,
+                Duration.between(start, Instant.now()).toMillis() < 2000L - 25L,
                 "second transaction should be less than two seconds"
         );
     }