--- a/browser/installer/windows/Makefile.in
+++ b/browser/installer/windows/Makefile.in
@@ -37,17 +37,17 @@ BRANDING_FILES = \
 	wizHeader.bmp \
 	wizHeaderRTL.bmp \
 	wizWatermark.bmp \
 	$(NULL)
 
 DEFINES += \
 	-DAB_CD=$(AB_CD) \
 	-DMOZ_APP_NAME=$(MOZ_APP_NAME) \
-	-DMOZ_APP_DISPLAYNAME=${MOZ_APP_DISPLAYNAME} \
+	-DMOZ_APP_DISPLAYNAME="${MOZ_APP_DISPLAYNAME}" \
 	-DMOZILLA_VERSION=${MOZILLA_VERSION} \
 	$(NULL)
 
 include $(topsrcdir)/config/config.mk
 
 ifdef LOCALE_MERGEDIR
 PPL_LOCALE_ARGS = \
   --l10n-dir=$(LOCALE_MERGEDIR)/browser/installer \

--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -166,17 +166,17 @@ RPMBUILD_BUILDDIR=$(_ABS_DIST)/..
 SPEC_FILE = $(RPMBUILD_SPECDIR)/mozilla.spec
 RPM_INCIDENTALS=$(topsrcdir)/toolkit/mozapps/installer/linux/rpm
 
 RPM_CMD = \
   echo Creating RPM && \
   mkdir -p $(RPMBUILD_SOURCEDIR) && \
   $(PYTHON) $(topsrcdir)/config/Preprocessor.py \
 	-DMOZ_APP_NAME=$(MOZ_APP_NAME) \
-	-DMOZ_APP_DISPLAYNAME=$(MOZ_APP_DISPLAYNAME) \
+	-DMOZ_APP_DISPLAYNAME="$(MOZ_APP_DISPLAYNAME)" \
 	< $(RPM_INCIDENTALS)/mozilla.desktop \
 	> $(RPMBUILD_SOURCEDIR)/$(MOZ_APP_NAME).desktop && \
   rm -rf $(_ABS_DIST)/$(TARGET_CPU) && \
   $(RPMBUILD) -bb \
   $(SPEC_FILE) \
   --target $(TARGET_CPU) \
   --buildroot $(RPMBUILD_TOPDIR)/BUILDROOT \
   --define "moz_app_name $(MOZ_APP_NAME)" \

--- a/toolkit/mozapps/update/test/Makefile.in
+++ b/toolkit/mozapps/update/test/Makefile.in
@@ -14,17 +14,17 @@ XPCSHELL_TESTS = \
   unit \
   $(NULL)
 
 TESTROOT = $(call core_abspath,$(DEPTH))/_tests/xpcshell/$(relativesrcdir)
 
 DEFINES += \
   -DAB_CD=$(AB_CD) \
   -DMOZ_APP_NAME=$(MOZ_APP_NAME) \
-  -DMOZ_APP_DISPLAYNAME=$(MOZ_APP_DISPLAYNAME) \
+  -DMOZ_APP_DISPLAYNAME="$(MOZ_APP_DISPLAYNAME)" \
   -DBIN_SUFFIX=$(BIN_SUFFIX) \
   -DNS_NO_XPCOM \
   -DMOZ_DEBUG=$(MOZ_DEBUG) \
   $(NULL)
 
 ifdef MOZ_MAINTENANCE_SERVICE
 DEFINES += -DMOZ_MAINTENANCE_SERVICE=$(MOZ_MAINTENANCE_SERVICE)
 endif

--- a/toolkit/mozapps/update/test_svc/Makefile.in
+++ b/toolkit/mozapps/update/test_svc/Makefile.in
@@ -14,17 +14,17 @@ XPCSHELL_TESTS = \
   unit \
   $(NULL)
 
 TESTROOT = $(call core_abspath,$(DEPTH))/_tests/xpcshell/$(relativesrcdir)
 
 DEFINES += \
   -DAB_CD=$(AB_CD) \
   -DMOZ_APP_NAME=$(MOZ_APP_NAME) \
-  -DMOZ_APP_DISPLAYNAME=$(MOZ_APP_DISPLAYNAME) \
+  -DMOZ_APP_DISPLAYNAME="$(MOZ_APP_DISPLAYNAME)" \
   -DBIN_SUFFIX=$(BIN_SUFFIX) \
   -DNS_NO_XPCOM \
   -DMOZ_DEBUG=$(MOZ_DEBUG) \
   $(NULL)
 
 # For debugging purposes only
 #DEFINES += -DDISABLE_UPDATER_AUTHENTICODE_CHECK