diff --git a/Makefile.in b/Makefile.in
index f964e19e..9b1176c4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -38,7 +38,7 @@ scripts_dir  := $(src_dir)/scripts
 
 HAVE_INT128 := @HAVE_INT128@
 HAVE_DLOPEN := @HAVE_DLOPEN@
-HAVE_CLANG_PCH := $(and @HAVE_CLANG_PCH@, $(if @BOOST_ASIO_LIB@,,yes))
+HAVE_CLANG_PCH := @HAVE_CLANG_PCH@
 
 # If the version information is not in the configure script, then we
 # assume that we are in a working directory. We use the vcs-version.sh