diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/GCTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/GCTest.java
index 8b6c00388..820a8ae07 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/GCTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/storage/file/GCTest.java
@@ -304,6 +304,7 @@ public void nonReferencedNonExpiredObject_notPruned() throws Exception {
 	public void nonReferencedExpiredObject_pruned() throws Exception {
 		RevBlob a = tr.blob("a");
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertFalse(repo.hasObject(a));
 	}
@@ -313,6 +314,7 @@ public void nonReferencedExpiredObjectTree_pruned() throws Exception {
 		RevBlob a = tr.blob("a");
 		RevTree t = tr.tree(tr.file("a", a));
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertFalse(repo.hasObject(t));
 		assertFalse(repo.hasObject(a));
@@ -336,6 +338,7 @@ public void lightweightTag_objectNotPruned() throws Exception {
 		RevBlob a = tr.blob("a");
 		tr.lightweightTag("t", a);
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertTrue(repo.hasObject(a));
 	}
@@ -347,6 +350,7 @@ public void annotatedTag_objectNotPruned() throws Exception {
 		tr.lightweightTag("t", t);
 
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertTrue(repo.hasObject(t));
 		assertTrue(repo.hasObject(a));
@@ -357,6 +361,7 @@ public void branch_historyNotPruned() throws Exception {
 		RevCommit tip = commitChain(10);
 		tr.branch("b").update(tip);
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		do {
 			assertTrue(repo.hasObject(tip));
@@ -376,6 +381,7 @@ public void deleteBranch_historyPruned() throws Exception {
 		update.setForceUpdate(true);
 		update.delete();
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertTrue(gc.getStatistics().numberOfLooseObjects == 0);
 	}
@@ -404,6 +410,7 @@ public void deleteMergedBranch_historyNotPruned() throws Exception {
 		update.delete();
 
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		assertTrue(repo.hasObject(b2Tip));
 	}
@@ -532,6 +539,7 @@ public void testNotPackTwice() throws Exception {
 		assertEquals(0, stats.numberOfPackedObjects);
 
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.gc();
 		stats = gc.getStatistics();
 		assertEquals(0, stats.numberOfLooseObjects);
@@ -581,6 +589,7 @@ public void testPackCommitsAndLooseOneWithPruneNow() throws Exception {
 		assertEquals(8, stats.numberOfLooseObjects);
 		assertEquals(0, stats.numberOfPackedObjects);
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.gc();
 		stats = gc.getStatistics();
 		assertEquals(0, stats.numberOfLooseObjects);
@@ -640,6 +649,7 @@ public void testIndexSavesObjectsWithPruneNow() throws Exception {
 		assertEquals(9, stats.numberOfLooseObjects);
 		assertEquals(0, stats.numberOfPackedObjects);
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.gc();
 		stats = gc.getStatistics();
 		assertEquals(0, stats.numberOfLooseObjects);
@@ -657,6 +667,7 @@ public void testPruneNone() throws Exception {
 		stats = gc.getStatistics();
 		assertEquals(8, stats.numberOfLooseObjects);
 		gc.setExpireAgeMillis(0);
+		fsTick();
 		gc.prune(Collections.<ObjectId> emptySet());
 		stats = gc.getStatistics();
 		assertEquals(8, stats.numberOfLooseObjects);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
index bf22569df..a416c742f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java
@@ -253,14 +253,16 @@ public void testIsModifiedFileSmudged() throws Exception {
 		// Hopefully fsTick will make sure our entry gets smudged
 		fsTick(f);
 		writeTrashFile("file", "content");
+		long lastModified = f.lastModified();
 		git.add().addFilepattern("file").call();
 		writeTrashFile("file", "conten2");
+		f.setLastModified(lastModified);
 		DirCacheEntry dce = db.readDirCache().getEntry("file");
 		FileTreeIterator fti = new FileTreeIterator(trash, db.getFS(), db
 				.getConfig().get(WorkingTreeOptions.KEY));
 		while (!fti.getEntryPathString().equals("file"))
 			fti.next(1);
-		// If the fsTick trick does not work we could skip the compareMetaData
+		// If the rounding trick does not work we could skip the compareMetaData
 		// test and hope that we are usually testing the intended code path.
 		assertEquals(MetadataDiff.SMUDGED, fti.compareMetadata(dce));
 		assertTrue(fti.isModified(dce, false));