diff --git a/compose/config/interpolation.py b/compose/config/interpolation.py
index a464f946569..ff0d90e8332 100644
--- a/compose/config/interpolation.py
+++ b/compose/config/interpolation.py
@@ -243,6 +243,7 @@ class ConversionMap:
         service_path('healthcheck', 'disable'): to_boolean,
         service_path('deploy', 'labels', PATH_JOKER): to_str,
         service_path('deploy', 'replicas'): to_int,
+        service_path('deploy', 'placement', 'max_replicas_per_node'): to_int,
         service_path('deploy', 'resources', 'limits', "cpus"): to_float,
         service_path('deploy', 'update_config', 'parallelism'): to_int,
         service_path('deploy', 'update_config', 'max_failure_ratio'): to_float,