diff --git a/stubdom/Makefile b/stubdom/Makefile
index 4fd86dd44b..98eba8efe3 100644
--- a/stubdom/Makefile
+++ b/stubdom/Makefile
@@ -25,7 +25,7 @@ endif
 
 include $(XEN_ROOT)/tools/libs/uselibs.mk
 
-define LIB_deps =
+define LIB_deps
  LIBDEPS_$(1) = $$(foreach use,$$(USELIBS_$(1)),libxen$$(use))
 endef
 $(foreach lib,$(LIBS_LIBS),$(eval $(call LIB_deps,$(lib))))
diff --git a/tools/Rules.mk b/tools/Rules.mk
index 7e019a8a65..385807a71c 100644
--- a/tools/Rules.mk
+++ b/tools/Rules.mk
@@ -94,7 +94,7 @@ endif
 # Consumers of libfoo should not directly use $(SHDEPS_libfoo) or
 # $(SHLIB_libfoo)
 
-define LIB_defs =
+define LIB_defs
  XEN_libxen$(1) = $$(XEN_ROOT)/tools/libs/$(1)
  CFLAGS_libxen$(1) = -I$$(XEN_libxen$(1))/include $$(CFLAGS_xeninclude)
  SHDEPS_libxen$(1) = $$(foreach use,$$(USELIBS_$(1)),$$(SHLIB_libxen$$(use)))