diff --git a/configure.ac b/configure.ac
index 36afe2ae5..11e641c9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -239,7 +239,10 @@ ax_enable_compile_warnings=yes
 dnl This is too intrusive for our DWG_TYPE_* switches
 ax_cv_check_cflags__Wswitch_enum=no
 dnl wasm does not support -fstack-protector yet
-if test x$enable_shared = xyes -a x$ac_compiler_gnu = xyes -a x$CC != xemcc; then
+if test x$enable_shared = xyes && \
+   test x$ac_compiler_gnu = xyes && \
+   test x$CC != xemcc
+then
   AX_COMPILER_FLAGS([WARN_CFLAGS],[AM_LDFLAGS],[$ax_is_release],
     [-fno-semantic-interposition -fwrapv -fno-common -fvisibility=hidden \
      -fno-strict-aliasing -ftrivial-auto-var-init=zero \