diff --git a/app/models/sample.rb b/app/models/sample.rb
index 8b2eb2c64..f5768ca27 100644
--- a/app/models/sample.rb
+++ b/app/models/sample.rb
@@ -20,7 +20,7 @@ def self.institution_is_required
   has_many :test_results, through: :sample_identifiers
 
   has_many :samples_reports, through: :samples_report_samples
-  has_many :samples_report_samples
+  has_many :samples_report_samples, dependent: :destroy
 
   has_many :assay_attachments, dependent: :destroy
   accepts_nested_attributes_for :assay_attachments, allow_destroy: true