diff --git a/libstats/socket/include/stats_event.h b/libstats/socket/include/stats_event.h
index 1760e7e..6a33d54 100644
--- a/libstats/socket/include/stats_event.h
+++ b/libstats/socket/include/stats_event.h
@@ -95,14 +95,14 @@
 void stats_event_write_float(struct stats_event* event, float value);
 void stats_event_write_bool(struct stats_event* event, bool value);
 
-void stats_event_write_byte_array(struct stats_event* event, uint8_t* buf, size_t numBytes);
+void stats_event_write_byte_array(struct stats_event* event, const uint8_t* buf, size_t numBytes);
 
 // Buf must be null-terminated.
 void stats_event_write_string8(struct stats_event* event, const char* buf);
 
 // Tags must be null-terminated.
-void stats_event_write_attribution_chain(struct stats_event* event, uint32_t* uids,
-                                         const char** tags, uint8_t numNodes);
+void stats_event_write_attribution_chain(struct stats_event* event, const uint32_t* uids,
+                                         const char* const* tags, uint8_t numNodes);
 
 /* key_value_pair struct can be constructed as follows:
  *    struct key_value_pair pair = {.key = key, .valueType = STRING_TYPE,
diff --git a/libstats/socket/stats_event.c b/libstats/socket/stats_event.c
index dfd587a..ef887e3 100644
--- a/libstats/socket/stats_event.c
+++ b/libstats/socket/stats_event.c
@@ -132,7 +132,7 @@
     }
 }
 
-static void append_byte_array(struct stats_event* event, uint8_t* buf, size_t size) {
+static void append_byte_array(struct stats_event* event, const uint8_t* buf, size_t size) {
     if (!overflows(event, size)) {
         memcpy(&event->buf[event->size], buf, size);
         event->size += size;
@@ -185,7 +185,7 @@
     append_bool(event, value);
 }
 
-void stats_event_write_byte_array(struct stats_event* event, uint8_t* buf, size_t numBytes) {
+void stats_event_write_byte_array(struct stats_event* event, const uint8_t* buf, size_t numBytes) {
     if (event->errors) return;
 
     start_field(event, BYTE_ARRAY_TYPE);
@@ -202,8 +202,8 @@
 }
 
 // Tags are assumed to be encoded using UTF8
-void stats_event_write_attribution_chain(struct stats_event* event, uint32_t* uids,
-                                         const char** tags, uint8_t numNodes) {
+void stats_event_write_attribution_chain(struct stats_event* event, const uint32_t* uids,
+                                         const char* const* tags, uint8_t numNodes) {
     if (numNodes > MAX_BYTE_VALUE) event->errors |= ERROR_ATTRIBUTION_CHAIN_TOO_LONG;
     if (event->errors) return;