--- a/browser/config/mozconfigs/macosx64/artifact
+++ b/browser/config/mozconfigs/macosx64/artifact
@@ -1,10 +1,13 @@
 MOZ_AUTOMATION_BUILD_SYMBOLS=0
 MOZ_AUTOMATION_L10N_CHECK=0
 
+# Needed to set SourceRepository in application.ini (used by Talos)
+export MOZILLA_OFFICIAL=1
+
 . "$topsrcdir/build/macosx/mozconfig.common"
 . "$topsrcdir/build/mozconfig.common.override"
 
 ac_add_options --enable-artifact-builds
 ac_add_options --enable-artifact-build-symbols
 unset CC
 unset CXX

--- a/browser/config/mozconfigs/win32/artifact
+++ b/browser/config/mozconfigs/win32/artifact
@@ -1,10 +1,13 @@
 MOZ_AUTOMATION_BUILD_SYMBOLS=0
 MOZ_AUTOMATION_L10N_CHECK=0
 
+# Needed to set SourceRepository in application.ini (used by Talos)
+export MOZILLA_OFFICIAL=1
+
 . "$topsrcdir/browser/config/mozconfigs/common"
 . "$topsrcdir/build/mozconfig.win-common"
 . "$topsrcdir/build/win32/mozconfig.vs-latest"
 . "$topsrcdir/build/mozconfig.common.override"
 
 ac_add_options --enable-artifact-builds
 ac_add_options --enable-artifact-build-symbols

--- a/browser/config/mozconfigs/win64/artifact
+++ b/browser/config/mozconfigs/win64/artifact
@@ -1,11 +1,14 @@
 MOZ_AUTOMATION_BUILD_SYMBOLS=0
 MOZ_AUTOMATION_L10N_CHECK=0
 
+# Needed to set SourceRepository in application.ini (used by Talos)
+export MOZILLA_OFFICIAL=1
+
 . "$topsrcdir/browser/config/mozconfigs/win64/common-win64"
 . "$topsrcdir/browser/config/mozconfigs/common"
 . "$topsrcdir/build/mozconfig.win-common"
 . "$topsrcdir/build/win64/mozconfig.vs-latest"
 . "$topsrcdir/build/mozconfig.common.override"
 
 ac_add_options --enable-artifact-builds
 ac_add_options --enable-artifact-build-symbols