diff --git a/src/configure b/src/configure
index 582268566..5d3b7a2a6 100755
--- a/src/configure
+++ b/src/configure
@@ -1553,7 +1553,7 @@ if test "${with_rt+set}" = set; then
   withval="$with_rt"
 
 else
-  with_rt=
+  with_rt=${enable_shared}
 fi;
 
 libdir="${libdir}/ecl"
@@ -9759,7 +9759,7 @@ LSP_FEATURES="(cons :wants-asdf ${LSP_FEATURES})"
 
 fi
 
-if test "" = "yes"; then
+if test "${with_rt}" = "yes"; then
 
 
 LSP_FEATURES="(cons :wants-rt ${LSP_FEATURES})"
diff --git a/src/configure.in b/src/configure.in
index d2820ba5c..0a7ba3955 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -131,7 +131,7 @@ AC_ARG_WITH(rt,
   AS_HELP_STRING( [--with-rt],
                   [include MIT-RT testing environment]
                   [(default=YES)]),
-  [], [with_rt=])
+  [], [with_rt=${enable_shared}])
 
 dnl -----------------------------------------------------------------------
 dnl Installation directories
@@ -441,7 +441,7 @@ if test "${with_asdf}" = "yes"; then
   ECL_ADD_LISP_MODULE([asdf])
 fi
 
-if test "" = "yes"; then
+if test "${with_rt}" = "yes"; then
   ECL_ADD_LISP_MODULE([rt])
 fi