diff --git a/tests/jsunit/field_variable_test.js b/tests/jsunit/field_variable_test.js
index 6d3ef9d66..bc36b7d69 100644
--- a/tests/jsunit/field_variable_test.js
+++ b/tests/jsunit/field_variable_test.js
@@ -175,7 +175,8 @@ function test_fieldVariable_getVariableTypes_nullVariableTypes() {
   fieldVariable.variableTypes = null;
 
   var resultTypes = fieldVariable.getVariableTypes_();
-  isEqualArrays(resultTypes, ['type1', 'type2']);
+  // The empty string is always one of the options.
+  isEqualArrays(resultTypes, ['type1', 'type2', '']);
   workspace.dispose();
 }
 
diff --git a/tests/jsunit/variable_map_test.js b/tests/jsunit/variable_map_test.js
index 568ce0b0d..3ccf674e2 100644
--- a/tests/jsunit/variable_map_test.js
+++ b/tests/jsunit/variable_map_test.js
@@ -269,14 +269,16 @@ function test_getVariableTypes_Trivial() {
   variable_map.createVariable('name3', 'type2', 'id3');
   variable_map.createVariable('name4', 'type3', 'id4');
   var result_array = variable_map.getVariableTypes();
-  isEqualArrays(['type1', 'type2', 'type3'], result_array);
+  // The empty string is always an option.
+  isEqualArrays(['type1', 'type2', 'type3', ''], result_array);
   variableMapTest_tearDown();
 }
 
 function test_getVariableTypes_None() {
   variableMapTest_setUp();
+  // The empty string is always an option.
   var result_array = variable_map.getVariableTypes();
-  isEqualArrays([], result_array);
+  isEqualArrays([''], result_array);
   variableMapTest_tearDown();
 }