diff --git a/src/ctr_encode_opentelemetry.c b/src/ctr_encode_opentelemetry.c
index c1e9c24..a7c12e3 100644
--- a/src/ctr_encode_opentelemetry.c
+++ b/src/ctr_encode_opentelemetry.c
@@ -20,6 +20,9 @@
 #include <ctraces/ctraces.h>
 #include <fluent-otel-proto/fluent-otel.h>
 
+static void destroy_scope_spans(Opentelemetry__Proto__Trace__V1__ScopeSpans **scope_spans,
+                         size_t count);
+
 static inline Opentelemetry__Proto__Common__V1__AnyValue *ctr_variant_to_otlp_any_value(struct cfl_variant *value);
 static inline Opentelemetry__Proto__Common__V1__KeyValue *ctr_variant_kvpair_to_otlp_kvpair(struct cfl_kvpair *input_pair);
 static inline Opentelemetry__Proto__Common__V1__AnyValue *ctr_variant_kvlist_to_otlp_any_value(struct cfl_variant *value);