diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 4daa959d4a1a182bd2cce42a94a9c3f5942cf33d..c360fc32ac1ac8cdd915cc116d96f6f262301de0 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -595,7 +595,7 @@ def package_finish(self):
         # it also does python-style % substitution
         self.replace_in("installers/windows/installer_template.nsi", tempfile, {
                 "%%VERSION%%":version_vars,
-                "%%SOURCE%%":self.get_src_sprefix(),
+                "%%SOURCE%%":self.get_src_prefix(),
                 "%%INST_VARS%%":inst_vars_template % substitution_strings,
                 "%%INSTALL_FILES%%":self.nsi_file_commands(True),
                 "%%DELETE_FILES%%":self.nsi_file_commands(False)})