diff --git a/build/variables.py b/build/variables.py
index d93335e93027..7761e6096c2e 100644
--- a/build/variables.py
+++ b/build/variables.py
@@ -9,6 +9,7 @@ import subprocess
 import sys
 from datetime import datetime
 
+SOURCESTAMP_FILENAME = 'sourcestamp.txt'
 
 def buildid_header(output):
     buildid = os.environ.get('MOZ_BUILD_DATE')
@@ -44,6 +45,26 @@ def get_hg_info(workdir):
 def get_hg_changeset(path):
     return get_program_output('hg', '-R', path, 'parent', '--template={node}')
 
+def get_info_from_sourcestamp(sourcestamp_path):
+    """Read the repository and changelog information from the sourcestamp
+    file. This assumes that the file exists and returns the results as a list
+    (either strings or None in case of error).
+    """
+
+    # Load the content of the file.
+    lines = None
+    with open(sourcestamp_path) as f:
+        lines = f.read().splitlines()
+
+    # Parse the repo and the changeset. The sourcestamp file is supposed to
+    # contain two lines: the first is the build id and the second is the source
+    # URL.
+    if len(lines) != 2 or not lines[1].startswith('http'):
+        # Just return if the file doesn't contain what we expect.
+        return None, None
+
+    # Return the repo and the changeset.
+    return lines[1].split('/rev/')
 
 def source_repo_header(output):
     # We allow the source repo and changeset to be specified via the
@@ -54,8 +75,11 @@ def source_repo_header(output):
     source = ''
 
     if not repo:
+        sourcestamp_path = os.path.join(buildconfig.topsrcdir, SOURCESTAMP_FILENAME)
         if os.path.exists(os.path.join(buildconfig.topsrcdir, '.hg')):
             repo, changeset = get_hg_info(buildconfig.topsrcdir)
+        elif os.path.exists(sourcestamp_path):
+            repo, changeset = get_info_from_sourcestamp(sourcestamp_path)
     elif not changeset:
         changeset = get_hg_changeset(buildconfig.topsrcdir)
         if not changeset:
diff --git a/toolkit/mozapps/installer/packager.mk b/toolkit/mozapps/installer/packager.mk
index a57b8d7fe329..902565c250cd 100644
--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -228,7 +228,17 @@ upload: checksum
 # source-package creates a source tarball from the files in MOZ_PKG_SRCDIR,
 # which is either set to a clean checkout or defaults to $topsrcdir
 source-package:
+	@echo 'Generate the sourcestamp file'
+	# Make sure to have repository information available and then generate the
+	# sourcestamp file.
+	$(MAKE) -C $(DEPTH) 'source-repo.h'
+	$(MAKE) make-sourcestamp-file
 	@echo 'Packaging source tarball...'
+	# We want to include the sourcestamp file in the source tarball, so copy it
+	# in the root source directory. This is useful to enable telemetry submissions
+	# from builds made from the source package with the correct revision information.
+	# Don't bother removing it as this is only used by automation.
+	@cp $(MOZ_SOURCESTAMP_FILE) '$(MOZ_PKG_SRCDIR)/sourcestamp.txt'
 	$(MKDIR) -p $(DIST)/$(PKG_SRCPACK_PATH)
 	(cd $(MOZ_PKG_SRCDIR) && $(CREATE_SOURCE_TAR) - ./ ) | xz -9e > $(SOURCE_TAR)