diff --git a/api/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto b/api/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto
index f945a31495944..f7efe0b5643a6 100644
--- a/api/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto
+++ b/api/envoy/config/resource_monitor/fixed_heap/v2alpha/fixed_heap.proto
@@ -7,11 +7,13 @@ option java_multiple_files = true;
 option java_package = "io.envoyproxy.envoy.config.resource_monitor.fixed_heap.v2alpha";
 option go_package = "v2alpha";
 
+import "validate/validate.proto";
+
 // [#protodoc-title: Fixed heap]
 
 // The fixed heap resource monitor reports the Envoy process memory pressure, computed as a
 // fraction of currently reserved heap memory divided by a statically configured maximum
 // specified in the FixedHeapConfig.
 message FixedHeapConfig {
-  uint64 max_heap_size_bytes = 1;
+  uint64 max_heap_size_bytes = 1 [(validate.rules).uint64.gt = 0];
 }
diff --git a/test/server/server_corpus/clusterfuzz-testcase-server_fuzz_test-5754606195310592 b/test/server/server_corpus/clusterfuzz-testcase-server_fuzz_test-5754606195310592
new file mode 100644
index 0000000000000..b116354122e8e
--- /dev/null
+++ b/test/server/server_corpus/clusterfuzz-testcase-server_fuzz_test-5754606195310592
@@ -0,0 +1,12 @@
+static_resources {
+}
+stats_config {
+  use_all_default_tags {
+    value: true
+  }
+}
+overload_manager {
+  resource_monitors {
+    name: "envoy.resource_monitors.fixed_heap"
+  }
+}