diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
index 54e7dd989..06819d3ef 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
@@ -409,6 +409,12 @@ public abstract class PackParser {
 					}
 
 					resolveDeltasWithExternalBases(progress);
+
+					if (entryCount < objectCount) {
+						throw new IOException(MessageFormat.format(JGitText
+								.get().packHasUnresolvedDeltas,
+								(objectCount - entryCount)));
+					}
 				}
 			}