diff --git a/app/src/adb.c b/app/src/adb.c
index 92a52b5b..630a1952 100644
--- a/app/src/adb.c
+++ b/app/src/adb.c
@@ -110,7 +110,7 @@ show_adb_err_msg(enum sc_process_result err, const char *const argv[]) {
     free(buf);
 }
 
-sc_pid
+static sc_pid
 adb_execute_p(const char *serial, const char *const adb_cmd[],
               size_t len, sc_pipe *pout) {
     int i;
@@ -148,7 +148,7 @@ adb_execute(const char *serial, const char *const adb_cmd[], size_t len) {
     return adb_execute_p(serial, adb_cmd, len, NULL);
 }
 
-sc_pid
+static sc_pid
 adb_exec_forward(const char *serial, uint16_t local_port,
                  const char *device_socket_name) {
     char local[4 + 5 + 1]; // tcp:PORT
@@ -159,7 +159,7 @@ adb_exec_forward(const char *serial, uint16_t local_port,
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-sc_pid
+static sc_pid
 adb_exec_forward_remove(const char *serial, uint16_t local_port) {
     char local[4 + 5 + 1]; // tcp:PORT
     sprintf(local, "tcp:%" PRIu16, local_port);
@@ -167,7 +167,7 @@ adb_exec_forward_remove(const char *serial, uint16_t local_port) {
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-sc_pid
+static sc_pid
 adb_exec_reverse(const char *serial, const char *device_socket_name,
                  uint16_t local_port) {
     char local[4 + 5 + 1]; // tcp:PORT
@@ -178,7 +178,7 @@ adb_exec_reverse(const char *serial, const char *device_socket_name,
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-sc_pid
+static sc_pid
 adb_exec_reverse_remove(const char *serial, const char *device_socket_name) {
     char remote[108 + 14 + 1]; // localabstract:NAME
     snprintf(remote, sizeof(remote), "localabstract:%s", device_socket_name);
@@ -186,7 +186,7 @@ adb_exec_reverse_remove(const char *serial, const char *device_socket_name) {
     return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
 }
 
-sc_pid
+static sc_pid
 adb_exec_push(const char *serial, const char *local, const char *remote) {
 #ifdef __WINDOWS__
     // Windows will parse the string, so the paths must be quoted
@@ -213,7 +213,7 @@ adb_exec_push(const char *serial, const char *local, const char *remote) {
     return pid;
 }
 
-sc_pid
+static sc_pid
 adb_exec_install(const char *serial, const char *local) {
 #ifdef __WINDOWS__
     // Windows will parse the string, so the local name must be quoted
@@ -234,7 +234,7 @@ adb_exec_install(const char *serial, const char *local) {
     return pid;
 }
 
-sc_pid
+static sc_pid
 adb_exec_get_serialno(sc_pipe *pout) {
     const char *const adb_cmd[] = {"get-serialno"};
     return adb_execute_p(NULL, adb_cmd, ARRAY_LEN(adb_cmd), pout);
diff --git a/app/src/adb.h b/app/src/adb.h
index 3714c17f..f58bc165 100644
--- a/app/src/adb.h
+++ b/app/src/adb.h
@@ -6,44 +6,11 @@
 #include <stdbool.h>
 #include <inttypes.h>
 
-#include "util/process.h"
 #include "util/intr.h"
 
 sc_pid
 adb_execute(const char *serial, const char *const adb_cmd[], size_t len);
 
-sc_pid
-adb_execute_p(const char *serial, const char *const adb_cmd[], size_t len,
-              sc_pipe *pout);
-
-sc_pid
-adb_exec_forward(const char *serial, uint16_t local_port,
-                 const char *device_socket_name);
-
-sc_pid
-adb_exec_forward_remove(const char *serial, uint16_t local_port);
-
-sc_pid
-adb_exec_reverse(const char *serial, const char *device_socket_name,
-                 uint16_t local_port);
-
-sc_pid
-adb_exec_reverse_remove(const char *serial, const char *device_socket_name);
-
-sc_pid
-adb_exec_push(const char *serial, const char *local, const char *remote);
-
-sc_pid
-adb_exec_install(const char *serial, const char *local);
-
-/**
- * Execute `adb get-serialno`
- *
- * The result can be read from the output parameter `pout`.
- */
-sc_pid
-adb_exec_get_serialno(sc_pipe *pout);
-
 bool
 adb_forward(struct sc_intr *intr, const char *serial, uint16_t local_port,
             const char *device_socket_name);