diff --git a/release/files_common b/release/files_common
index d0afa30dea..3d07924a91 100644
--- a/release/files_common
+++ b/release/files_common
@@ -280,7 +280,6 @@ selfdrive/loggerd/deleter.py
 selfdrive/loggerd/xattr_cache.py
 
 selfdrive/sensord/SConscript
-selfdrive/sensord/libdiag.h
 selfdrive/sensord/sensors_qcom2.cc
 selfdrive/sensord/sensors/*.cc
 selfdrive/sensord/sensors/*.h
diff --git a/selfdrive/sensord/libdiag.h b/selfdrive/sensord/libdiag.h
deleted file mode 100644
index 03a59464ed..0000000000
--- a/selfdrive/sensord/libdiag.h
+++ /dev/null
@@ -1,37 +0,0 @@
-#pragma once
-
-#include <stdint.h>
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#define DIAG_MAX_RX_PKT_SIZ 4096
-
-bool Diag_LSM_Init(uint8_t* pIEnv);
-bool Diag_LSM_DeInit(void);
-
-// DCI
-
-#define DIAG_CON_APSS 0x001
-#define DIAG_CON_MPSS 0x002
-#define DIAG_CON_LPASS 0x004
-#define DIAG_CON_WCNSS 0x008
-
-enum {
-  DIAG_DCI_NO_ERROR = 1001,
-} diag_dci_error_type;
-
-int diag_register_dci_client(int*, uint16_t*, int, void*);
-int diag_log_stream_config(int client_id, int set_mask, uint16_t log_codes_array[], int num_codes);
-int diag_register_dci_stream(void (*func_ptr_logs)(unsigned char *ptr, int len), void (*func_ptr_events)(unsigned char *ptr, int len));
-int diag_release_dci_client(int*);
-
-int diag_send_dci_async_req(int client_id, unsigned char buf[], int bytes, unsigned char *rsp_ptr, int rsp_len,
-                            void (*func_ptr)(unsigned char *ptr, int len, void *data_ptr), void *data_ptr);
-
-
-#ifdef __cplusplus
-}
-#endif