diff --git a/suite/debugQA/Makefile.in b/suite/debugQA/Makefile.in
index ce3d9eed7a..c1e94c7304 100644
--- a/suite/debugQA/Makefile.in
+++ b/suite/debugQA/Makefile.in
@@ -16,9 +16,4 @@ XPI_PKGNAME            = debugQA-$(MOZ_APP_VERSION)
 
 DIST_FILES = install.rdf
 
-XULAPP_DEFINES = \
-    -DMOZ_APP_VERSION=$(MOZ_APP_VERSION) \
-    -DMOZ_APP_MAXVERSION=$(MOZ_APP_MAXVERSION) \
-    $(NULL)
-
 include $(topsrcdir)/config/rules.mk
diff --git a/suite/debugQA/moz.build b/suite/debugQA/moz.build
index 3fafdfa341..b89e0a25ad 100644
--- a/suite/debugQA/moz.build
+++ b/suite/debugQA/moz.build
@@ -10,3 +10,6 @@ XPI_NAME = 'debugQA'
 JAR_MANIFESTS += ['jar.mn']
 
 USE_EXTENSION_MANIFEST = True
+
+DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ_APP_VERSION']
+DEFINES['MOZ_APP_MAXVERSION'] = CONFIG['MOZ_APP_MAXVERSION']