diff --git a/erpnext/projects/doctype/project/project.py b/erpnext/projects/doctype/project/project.py
index 979c4fcace..44b0c00e65 100644
--- a/erpnext/projects/doctype/project/project.py
+++ b/erpnext/projects/doctype/project/project.py
@@ -75,7 +75,7 @@ class Project(Document):
 		sum = 0
 		for task in self.tasks:
 			if task.task_weight > 0:
-				sum = sum + task.task_weight
+				sum = flt(sum + task.task_weight, task.precision('task_weight'))
 		if sum > 0 and sum != 1:
 			frappe.throw(_("Total of all task weights should be 1. Please adjust weights of all Project tasks accordingly"))