diff --git a/src/configure b/src/configure
index 1f725280a2..3e29d24472 100755
--- a/src/configure
+++ b/src/configure
@@ -5120,7 +5120,7 @@ if test "${enable_libffi}" = "yes" ; then
  if test "${enable_foreign}" = "yes" ; then
   { echo "$as_me:$LINENO: checking for libffi" >&5
 echo $ECHO_N "checking for libffi... $ECHO_C" >&6; }
-  OLD_LD_FLAGS="${LDFLAGS}"
+  OLD_LDFLAGS="${LDFLAGS}"
   LDFLAGS="${LDFLAGS} -lffi"
   cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
diff --git a/src/racket/configure.ac b/src/racket/configure.ac
index 5f353eb360..e94881fbe6 100644
--- a/src/racket/configure.ac
+++ b/src/racket/configure.ac
@@ -855,7 +855,7 @@ AC_MSG_RESULT($mbsrtowcs)
 if test "${enable_libffi}" = "yes" ; then
  if test "${enable_foreign}" = "yes" ; then
   AC_MSG_CHECKING([for libffi])
-  OLD_LD_FLAGS="${LDFLAGS}"
+  OLD_LDFLAGS="${LDFLAGS}"
   LDFLAGS="${LDFLAGS} -lffi"
   AC_TRY_LINK([#include <ffi.h>],
               [ffi_cif cif; ]