diff --git a/src/aclocal.m4 b/src/aclocal.m4
index 96229a3ed..e1496d638 100644
--- a/src/aclocal.m4
+++ b/src/aclocal.m4
@@ -997,7 +997,7 @@ if test "${enable_libffi}" = auto -o "${enable_libffi}" = system; then
      AC_MSG_ERROR([System libffi library requested but not found.])
    fi
  else
-   CORE_LIBS="${FASL_LIBS} -lffi"
+   FASL_LIBS="${FASL_LIBS} -lffi"
  fi
 fi
 if test "${enable_libffi}" = "included"; then
diff --git a/src/configure b/src/configure
index c71c90b30..d814a7822 100755
--- a/src/configure
+++ b/src/configure
@@ -7178,7 +7178,7 @@ $as_echo "$as_me: error: System libffi library requested but not found." >&2;}
    { (exit 1); exit 1; }; }
    fi
  else
-   CORE_LIBS="${FASL_LIBS} -lffi"
+   FASL_LIBS="${FASL_LIBS} -lffi"
  fi
 fi
 if test "${enable_libffi}" = "included"; then