diff --git a/aclocal.m4 b/aclocal.m4
index f0b98985d..8e5745c9b 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -88,7 +88,7 @@ if test $DYNAMIC_LINKER = null; then
     AC_CHECK_HEADER(dld/defs.h, objc_found_dld_defs=yes, objc_found_dld_defs=no)
     # Try to distinguish between GNU dld and HPUX dld 
     AC_CHECK_HEADER(dl.h, [DYNAMIC_LINKER=hpux])
-    if test $ac_cv_lib_dld = yes && test $objc_found_dld_defs = no && test $ac_cv_header_dl_h = no; then
+    if test "$ac_cv_lib_dld" = yes && test "$objc_found_dld_defs" = no && test "$ac_cv_header_dl_h" = no; then
         AC_MSG_WARN(Could not find dld/defs.h header)
         echo
         echo "Currently, the dld/defs.h header is needed to get information"