diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
index 6188fa60c..7a74fd3cb 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/attributes/CGitAttributesTest.java
@@ -125,11 +125,12 @@ public class CGitAttributesTest extends RepositoryTestCase {
 		ProcessBuilder builder = fs.runInShell("git",
 				new String[] { "check-attr", "--stdin", "--all" });
 		builder.directory(db.getWorkTree());
+		builder.environment().put("HOME", fs.userHome().getAbsolutePath());
 		ExecutionResult result = fs.execute(builder, new ByteArrayInputStream(
 				input.toString().getBytes(Constants.CHARSET)));
-		assertEquals("External git reported errors", "",
-				toString(result.getStderr()));
-		assertEquals("External git failed", 0, result.getRc());
+		String errorOut = toString(result.getStderr());
+		assertEquals("External git failed", "exit 0\n",
+				"exit " + result.getRc() + '\n' + errorOut);
 		LinkedHashMap<String, Attributes> map = new LinkedHashMap<>();
 		try (BufferedReader r = new BufferedReader(new InputStreamReader(
 				new BufferedInputStream(result.getStdout().openInputStream()),
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
index c61f2ea7f..baf9f9c95 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/ignore/CGitIgnoreTest.java
@@ -105,11 +105,12 @@ public class CGitIgnoreTest extends RepositoryTestCase {
 		ProcessBuilder builder = fs.runInShell("git", new String[] { "ls-files",
 				"--ignored", "--exclude-standard", "-o" });
 		builder.directory(db.getWorkTree());
+		builder.environment().put("HOME", fs.userHome().getAbsolutePath());
 		ExecutionResult result = fs.execute(builder,
 				new ByteArrayInputStream(new byte[0]));
-		assertEquals("External git failed", 0, result.getRc());
-		assertEquals("External git reported errors", "",
-				toString(result.getStderr()));
+		String errorOut = toString(result.getStderr());
+		assertEquals("External git failed", "exit 0\n",
+				"exit " + result.getRc() + '\n' + errorOut);
 		try (BufferedReader r = new BufferedReader(new InputStreamReader(
 				new BufferedInputStream(result.getStdout().openInputStream()),
 				Constants.CHARSET))) {
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
index 4f3b601d3..4228c9dbe 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/indexdiff/IndexDiffWithSymlinkTest.java
@@ -142,7 +142,11 @@ public class IndexDiffWithSymlinkTest extends LocalDiskRepositoryTestCase {
 		String[] cmd = { "/bin/sh", "./" + name + ".sh" };
 		int exitCode;
 		String stdErr;
-		Process process = Runtime.getRuntime().exec(cmd, null, testDir);
+		ProcessBuilder builder = new ProcessBuilder(cmd);
+		builder.environment().put("HOME",
+				FS.DETECTED.userHome().getAbsolutePath());
+		builder.directory(testDir);
+		Process process = builder.start();
 		try (InputStream stdOutStream = process.getInputStream();
 				InputStream stdErrStream = process.getErrorStream();
 				OutputStream stdInStream = process.getOutputStream()) {