diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameResult.java b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameResult.java
index 2d445fd7b..faaa227b4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameResult.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/blame/BlameResult.java
@@ -290,6 +290,10 @@ public void computeRange(int start, int end) throws IOException {
 		BlameGenerator gen = generator;
 		if (gen == null)
 			return;
+		if (start == 0 && end == resultContents.size()) {
+			computeAll();
+			return;
+		}
 
 		while (start < end) {
 			if (hasSourceData(start, end))