diff --git a/neuralogic/core/constructs/java_objects.py b/neuralogic/core/constructs/java_objects.py
index 677b441a..115676af 100644
--- a/neuralogic/core/constructs/java_objects.py
+++ b/neuralogic/core/constructs/java_objects.py
@@ -302,7 +302,7 @@ def get_rule(self, rule):
         java_rule.setOffset(offset)
 
         if rule.metadata is not None:
-            java_rule.allowDuplicitGroundings = rule.metadata.duplicit_grounding
+            java_rule.allowDuplicitGroundings = bool(rule.metadata.duplicit_grounding)
 
         java_rule.setMetadata(self.get_metadata(rule.metadata, self.rule_metadata))