diff --git a/src/Microsoft.AspNetCore.Server.Kestrel.Https/project.json b/src/Microsoft.AspNetCore.Server.Kestrel.Https/project.json
index 05d95e5e65..9300fd626a 100644
--- a/src/Microsoft.AspNetCore.Server.Kestrel.Https/project.json
+++ b/src/Microsoft.AspNetCore.Server.Kestrel.Https/project.json
@@ -6,6 +6,7 @@
     "nowarn": [
       "CS1591"
     ],
+    "warningsAsErrors": true,
     "xmlDoc": true
   },
   "packOptions": {
diff --git a/src/Microsoft.AspNetCore.Server.Kestrel/project.json b/src/Microsoft.AspNetCore.Server.Kestrel/project.json
index a83047073a..6305b879f8 100644
--- a/src/Microsoft.AspNetCore.Server.Kestrel/project.json
+++ b/src/Microsoft.AspNetCore.Server.Kestrel/project.json
@@ -56,6 +56,7 @@
   },
   "buildOptions": {
     "allowUnsafe": true,
+    "warningsAsErrors": true,
     "keyFile": "../../tools/Key.snk",
     "nowarn": [
       "CS1591"