diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
index 141ea8e20..a7a7f1880 100644
--- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
+++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
@@ -158,6 +158,7 @@ commitGraphChunkNeeded=commit-graph 0x{0} chunk has not been loaded
 commitGraphChunkRepeated=commit-graph chunk id 0x{0} appears multiple times
 commitGraphChunkUnknown=unknown commit-graph chunk: 0x{0}
 commitGraphFileIsTooLargeForJgit=commit-graph file is too large for jgit
+commitGraphUnexpectedSize=Commit-graph: expected %d bytes but out has %d bytes
 commitGraphWritingCancelled=commit-graph writing was canceled
 commitMessageNotSpecified=commit message not specified
 commitOnRepoWithoutHEADCurrentlyNotSupported=Commit on repo without HEAD currently not supported
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
index f0d665733..f42e33404 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
@@ -187,6 +187,7 @@ public static JGitText get() {
 	/***/ public String commitGraphChunkRepeated;
 	/***/ public String commitGraphChunkUnknown;
 	/***/ public String commitGraphFileIsTooLargeForJgit;
+	/***/ public String commitGraphUnexpectedSize;
 	/***/ public String commitGraphWritingCancelled;
 	/***/ public String commitMessageNotSpecified;
 	/***/ public String commitOnRepoWithoutHEADCurrentlyNotSupported;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/commitgraph/CommitGraphWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/commitgraph/CommitGraphWriter.java
index 38ae02957..ae7b379c1 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/commitgraph/CommitGraphWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/commitgraph/CommitGraphWriter.java
@@ -146,8 +146,9 @@ public Stats write(@NonNull ProgressMonitor monitor,
 			writeCheckSum(out);
 			if (expectedSize != out.length()) {
 				throw new IllegalStateException(String.format(
-						"Commit-graph: expected %d bytes but out has %d bytes", //$NON-NLS-1$
-						expectedSize, out.length()));
+						JGitText.get().commitGraphUnexpectedSize,
+						Long.valueOf(expectedSize),
+						Long.valueOf(out.length())));
 			}
 		} catch (InterruptedIOException e) {
 			throw new IOException(JGitText.get().commitGraphWritingCancelled,