diff --git a/bottlecap/src/config/mod.rs b/bottlecap/src/config/mod.rs
index f26c8e9b2..c79a76c8c 100644
--- a/bottlecap/src/config/mod.rs
+++ b/bottlecap/src/config/mod.rs
@@ -25,11 +25,16 @@ use crate::config::service_mapping::deserialize_service_mapping;
 #[derive(Debug, PartialEq, Deserialize, Clone, Default)]
 #[serde(default)]
 #[allow(clippy::module_name_repetitions)]
+#[allow(clippy::struct_excessive_bools)]
 pub struct FallbackConfig {
     extension_version: Option<String>,
     serverless_appsec_enabled: bool,
     appsec_enabled: bool,
     profiling_enabled: bool,
+    // otel
+    trace_otel_enabled: bool,
+    otlp_config_receiver_protocols_http_endpoint: Option<String>,
+    otlp_config_receiver_protocols_grpc_endpoint: Option<String>,
 }
 
 #[derive(Debug, PartialEq, Deserialize, Clone, Default)]
@@ -165,6 +170,18 @@ fn fallback(figment: &Figment) -> Result<(), ConfigError> {
         ));
     }
 
+    if fallback_config.trace_otel_enabled
+        || fallback_config
+            .otlp_config_receiver_protocols_http_endpoint
+            .is_some()
+        || fallback_config
+            .otlp_config_receiver_protocols_grpc_endpoint
+            .is_some()
+    {
+        log_fallback_reason("otel");
+        return Err(ConfigError::UnsupportedField("otel".to_string()));
+    }
+
     Ok(())
 }
 
@@ -255,6 +272,22 @@ pub mod tests {
         });
     }
 
+    #[test]
+    fn test_fallback_on_otel() {
+        figment::Jail::expect_with(|jail| {
+            jail.clear_env();
+            jail.set_env("DD_EXTENSION_VERSION", "next");
+            jail.set_env(
+                "DD_OTLP_CONFIG_RECEIVER_PROTOCOLS_HTTP_ENDPOINT",
+                "localhost:4138",
+            );
+
+            let config = get_config(Path::new("")).expect_err("should reject unknown fields");
+            assert_eq!(config, ConfigError::UnsupportedField("otel".to_string()));
+            Ok(())
+        });
+    }
+
     #[test]
     fn test_allowed_but_disabled() {
         figment::Jail::expect_with(|jail| {