diff --git a/mozilla/js/src/xpconnect/src/Makefile.in b/mozilla/js/src/xpconnect/src/Makefile.in
index 1bd227b4e79..0cd435d34c5 100644
--- a/mozilla/js/src/xpconnect/src/Makefile.in
+++ b/mozilla/js/src/xpconnect/src/Makefile.in
@@ -160,7 +160,7 @@ ifeq (,$(findstring GL,$(CXXFLAGS)))
 # use pre-compiled headers
 CXXFLAGS	+= -YX -Fp$(LIBRARY_NAME).pch
 # precompiled headers require write access to .pch which breaks -j builds
-.NOTPARALLEL::
+.NOTPARALLEL:
 endif
 endif
 endif