diff --git a/cf/Makefile.am.common b/cf/Makefile.am.common
index e3b72bf2e..b9e8e122e 100644
--- a/cf/Makefile.am.common
+++ b/cf/Makefile.am.common
@@ -63,10 +63,7 @@ install-suid-programs:
 install-exec-hook: install-suid-programs
 
 install-build-headers::
-	@foo='$(include_HEADERS)'; \
-	if test -n "$(build_HEADERZ)"; then \
-		foo="$$foo $(build_HEADERZ)"; \
-	fi; \
+	@foo='$(include_HEADERS) $(build_HEADERZ)'; \
 	for f in $$foo; do \
 		f=`basename $$f`; \
 		if test -f "$(srcdir)/$$f"; then file="$(srcdir)/$$f"; \