diff --git a/internal/db/schema/migrations/oss/postgres/26/01_wh_network_address_dimensions.up.sql b/internal/db/schema/migrations/oss/postgres/26/01_wh_network_address_dimensions.up.sql
index 46bf01f8e..87ce20c0e 100644
--- a/internal/db/schema/migrations/oss/postgres/26/01_wh_network_address_dimensions.up.sql
+++ b/internal/db/schema/migrations/oss/postgres/26/01_wh_network_address_dimensions.up.sql
@@ -108,7 +108,7 @@ begin;
     ip4_address,
     ip6_address
   )
-  select
+  select distinct
     address,
     'IP Address',
     case
@@ -135,7 +135,7 @@ begin;
     dns_name,
     ip4_address,       ip6_address
   )
-  select
+  select distinct
     whd.host_address,  'DNS Name',
     'Not Applicable',  'Not Applicable',
     whd.host_address,
diff --git a/internal/db/schema/migrations/oss/postgres_26_01_test.go b/internal/db/schema/migrations/oss/postgres_26_01_test.go
index 1866e8c58..c6f1b9f8f 100644
--- a/internal/db/schema/migrations/oss/postgres_26_01_test.go
+++ b/internal/db/schema/migrations/oss/postgres_26_01_test.go
@@ -185,6 +185,11 @@ values
 			_, err := rw.Exec(ctx, q, []interface{}{a.Address})
 			require.NoError(t, err)
 		}
+		// Duplicate a few records...
+		_, err := rw.Exec(ctx, q, []interface{}{addresses[1].Address})
+		require.NoError(t, err)
+		_, err = rw.Exec(ctx, q, []interface{}{addresses[5].Address})
+		require.NoError(t, err)
 	}
 
 	// now we're ready for the migration we want to test.