diff --git a/servicetalk-grpc-netty/src/main/java/io/servicetalk/grpc/netty/DefaultGrpcServerBuilder.java b/servicetalk-grpc-netty/src/main/java/io/servicetalk/grpc/netty/DefaultGrpcServerBuilder.java
index 9c05026032..24f3215cc9 100644
--- a/servicetalk-grpc-netty/src/main/java/io/servicetalk/grpc/netty/DefaultGrpcServerBuilder.java
+++ b/servicetalk-grpc-netty/src/main/java/io/servicetalk/grpc/netty/DefaultGrpcServerBuilder.java
@@ -93,8 +93,9 @@ final class DefaultGrpcServerBuilder implements GrpcServerBuilder, ServerBinder
 
     // Do not use this ctor directly, GrpcServers is the entry point for creating a new builder.
     DefaultGrpcServerBuilder(final Supplier<HttpServerBuilder> httpServerBuilderSupplier) {
-        this.httpServerBuilderSupplier = () -> httpServerBuilderSupplier.get()
-                .protocols(h2Default()).allowDropRequestTrailers(true);
+        this.httpServerBuilderSupplier = () ->
+                requireNonNull(httpServerBuilderSupplier.get(), "Supplier<HttpServerBuilder> result was null")
+                    .protocols(h2Default()).allowDropRequestTrailers(true);
     }
 
     @Override