diff --git a/compat/fsmonitor/fsm-health-darwin.c b/compat/fsmonitor/fsm-health-darwin.c
index 5b1709d63f..c2afcbe6c8 100644
--- a/compat/fsmonitor/fsm-health-darwin.c
+++ b/compat/fsmonitor/fsm-health-darwin.c
@@ -4,21 +4,21 @@
 #include "fsm-health.h"
 #include "fsmonitor--daemon.h"
 
-int fsm_health__ctor(struct fsmonitor_daemon_state *state)
+int fsm_health__ctor(struct fsmonitor_daemon_state *state UNUSED)
 {
 	return 0;
 }
 
-void fsm_health__dtor(struct fsmonitor_daemon_state *state)
+void fsm_health__dtor(struct fsmonitor_daemon_state *state UNUSED)
 {
 	return;
 }
 
-void fsm_health__loop(struct fsmonitor_daemon_state *state)
+void fsm_health__loop(struct fsmonitor_daemon_state *state UNUSED)
 {
 	return;
 }
 
-void fsm_health__stop_async(struct fsmonitor_daemon_state *state)
+void fsm_health__stop_async(struct fsmonitor_daemon_state *state UNUSED)
 {
 }
diff --git a/compat/fsmonitor/fsm-path-utils-win32.c b/compat/fsmonitor/fsm-path-utils-win32.c
index c8a3e9dcdb..f4f9cc1f33 100644
--- a/compat/fsmonitor/fsm-path-utils-win32.c
+++ b/compat/fsmonitor/fsm-path-utils-win32.c
@@ -132,7 +132,8 @@ int fsmonitor__is_fs_remote(const char *path)
 /*
  * No-op for now.
  */
-int fsmonitor__get_alias(const char *path, struct alias_info *info)
+int fsmonitor__get_alias(const char *path UNUSED,
+			 struct alias_info *info UNUSED)
 {
 	return 0;
 }
@@ -140,8 +141,8 @@ int fsmonitor__get_alias(const char *path, struct alias_info *info)
 /*
  * No-op for now.
  */
-char *fsmonitor__resolve_alias(const char *path,
-	const struct alias_info *info)
+char *fsmonitor__resolve_alias(const char *path UNUSED,
+			       const struct alias_info *info UNUSED)
 {
 	return NULL;
 }
diff --git a/fsmonitor-ipc.c b/fsmonitor-ipc.c
index 88575aa54c..153918cf76 100644
--- a/fsmonitor-ipc.c
+++ b/fsmonitor-ipc.c
@@ -20,7 +20,7 @@ int fsmonitor_ipc__is_supported(void)
 	return 0;
 }
 
-const char *fsmonitor_ipc__get_path(struct repository *r)
+const char *fsmonitor_ipc__get_path(struct repository *r UNUSED)
 {
 	return NULL;
 }
@@ -30,14 +30,14 @@ enum ipc_active_state fsmonitor_ipc__get_state(void)
 	return IPC_STATE__OTHER_ERROR;
 }
 
-int fsmonitor_ipc__send_query(const char *since_token,
-			      struct strbuf *answer)
+int fsmonitor_ipc__send_query(const char *since_token UNUSED,
+			      struct strbuf *answer UNUSED)
 {
 	return -1;
 }
 
-int fsmonitor_ipc__send_command(const char *command,
-				struct strbuf *answer)
+int fsmonitor_ipc__send_command(const char *command UNUSED,
+				struct strbuf *answer UNUSED)
 {
 	return -1;
 }