diff --git a/libpub/parse.yy b/libpub/parse.yy
index 9798905d..517a4b49 100644
--- a/libpub/parse.yy
+++ b/libpub/parse.yy
@@ -720,7 +720,11 @@ p3_bindings: p3_binding
 
 p3_binding: p3_bind_key p3_bind_value_opt
 	{
-	   $$ = pub3::binding_t ($1, $2);
+       auto v = $2;
+       if (!v) {
+          v = pub3::expr_null_t::alloc();
+       }
+	   $$ = pub3::binding_t ($1, v);
 	}
 	;
 
diff --git a/test/pub/Makefile.am b/test/pub/Makefile.am
index 6834bdb3..a5b76539 100644
--- a/test/pub/Makefile.am
+++ b/test/pub/Makefile.am
@@ -1,6 +1,7 @@
 PACKAGE_STRING=pub
 TESTS = \
 	dict_equal.pub \
+	empty_key.pub \
 	scoping_for.pub \
 	scoping_globals-locals.pub \
 	scoping_order_of_decl.pub \
diff --git a/test/pub/empty_key.expected b/test/pub/empty_key.expected
new file mode 100644
index 00000000..6d255f55
--- /dev/null
+++ b/test/pub/empty_key.expected
@@ -0,0 +1 @@
+["x", "y"]
diff --git a/test/pub/empty_key.pub b/test/pub/empty_key.pub
new file mode 100644
index 00000000..09a7ff47
--- /dev/null
+++ b/test/pub/empty_key.pub
@@ -0,0 +1,5 @@
+{%
+x = 5;
+v = {x:x, y}
+print(sort(keys(v)));
+%}