diff --git a/tools/releasetools/ota_from_target_files b/tools/releasetools/ota_from_target_files
index 7261b1babf..9bbaf1a291 100755
--- a/tools/releasetools/ota_from_target_files
+++ b/tools/releasetools/ota_from_target_files
@@ -418,7 +418,7 @@ def GetBuildProp(property, z):
     return bp
   m = re.search(re.escape(property) + r"=(.*)\n", bp)
   if not m:
-    raise ExternalException("couldn't find %s in build.prop" % (property,))
+    raise common.ExternalError("couldn't find %s in build.prop" % (property,))
   return m.group(1).strip()
 
 
@@ -476,7 +476,7 @@ def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
     if sf is None or fn in OPTIONS.require_verbatim:
       # This file should be included verbatim
       if fn in OPTIONS.prohibit_verbatim:
-        raise ExternalError("\"%s\" must be sent verbatim" % (fn,))
+        raise common.ExternalError("\"%s\" must be sent verbatim" % (fn,))
       print "send", fn, "verbatim"
       tf.AddToZip(output_zip)
       verbatim_targets.append((fn, tf.size))