diff --git a/sys/contrib/openzfs/lib/libspl/assert.c b/sys/contrib/openzfs/lib/libspl/assert.c
index 315ddd6b9a9..d11361b387e 100644
--- a/sys/contrib/openzfs/lib/libspl/assert.c
+++ b/sys/contrib/openzfs/lib/libspl/assert.c
@@ -65,19 +65,6 @@ libspl_gettid(void)
 }
 #endif
 
-#if defined(__APPLE__)
-static inline uint64_t
-libspl_gettid(void)
-{
-	uint64_t tid;
-
-	if (pthread_threadid_np(NULL, &tid) != 0)
-		tid = 0;
-
-	return (tid);
-}
-#endif
-
 static boolean_t libspl_assert_ok = B_FALSE;
 
 void