--- a/common/autoconf/jdk-options.m4	Fri Feb 03 14:34:00 2017 +0100
+++ b/common/autoconf/jdk-options.m4	Fri Feb 03 15:19:38 2017 +0100
@@ -210,10 +210,10 @@
   AC_MSG_CHECKING([if elliptic curve crypto implementation is present])
 
   if test -d "${SRC_ROOT}/jdk/src/jdk.crypto.ec/share/native/libsunec/impl"; then
-    ENABLE_INTREE_EC=yes
+    ENABLE_INTREE_EC=true
     AC_MSG_RESULT([yes])
   else
-    ENABLE_INTREE_EC=no
+    ENABLE_INTREE_EC=false
     AC_MSG_RESULT([no])
   fi