diff --git a/lib/api/treatments/index.js b/lib/api/treatments/index.js
index fc009ae1835..996c646a02d 100644
--- a/lib/api/treatments/index.js
+++ b/lib/api/treatments/index.js
@@ -63,18 +63,20 @@ function configure (app, wares, ctx, env) {
       }
     });
 
-    if (!_isNil(d1)) res.setHeader('Last-Modified', d1.toUTCString());
-
-    if (ifModifiedSince && d1.getTime() <= moment(ifModifiedSince).valueOf()) {
-      res.status(304).send({
-        status: 304
-        , message: 'Not modified'
-        , type: 'internal'
-      });
-      return;
-    } else {
-      return res.json(results);
+    if (!_isNil(d1)) {
+      res.setHeader('Last-Modified', d1.toUTCString());
+
+      if (ifModifiedSince && d1.getTime() <= moment(ifModifiedSince).valueOf()) {
+        res.status(304).send({
+          status: 304
+          , message: 'Not modified'
+          , type: 'internal'
+        });
+        return;
+      }
     }
+
+    return res.json(results);
   }
 
   // List treatments available