diff --git a/flecs.c b/flecs.c
index a6ffac070..93f13ec3b 100644
--- a/flecs.c
+++ b/flecs.c
@@ -27799,6 +27799,7 @@ ecs_entity_t flecs_largest_type(
     case EcsEntity: return ecs_id(ecs_entity_t);
     default: ecs_abort(ECS_INTERNAL_ERROR, NULL);
     }
+    return 0;
 }
 
 /** Test if a normalized type can promote to another type in an expression */
@@ -42681,6 +42682,7 @@ ecs_oper_kind_t flecs_parse_operator(
     } else {
         ecs_abort(ECS_INTERNAL_ERROR, NULL);
     }
+    return 0;
 }
 
 static
diff --git a/src/addons/expr/deserialize.c b/src/addons/expr/deserialize.c
index 4dbd1b2c0..d4490ba31 100644
--- a/src/addons/expr/deserialize.c
+++ b/src/addons/expr/deserialize.c
@@ -381,6 +381,7 @@ ecs_entity_t flecs_largest_type(
     case EcsEntity: return ecs_id(ecs_entity_t);
     default: ecs_abort(ECS_INTERNAL_ERROR, NULL);
     }
+    return 0;
 }
 
 /** Test if a normalized type can promote to another type in an expression */
diff --git a/src/addons/parser.c b/src/addons/parser.c
index 90be5dbe4..862473f0e 100644
--- a/src/addons/parser.c
+++ b/src/addons/parser.c
@@ -325,6 +325,7 @@ ecs_oper_kind_t flecs_parse_operator(
     } else {
         ecs_abort(ECS_INTERNAL_ERROR, NULL);
     }
+    return 0;
 }
 
 static