diff --git a/libs/temporal/temporal/superclock.h b/libs/temporal/temporal/superclock.h
index 8b5d950bcb..d4182f8a28 100644
--- a/libs/temporal/temporal/superclock.h
+++ b/libs/temporal/temporal/superclock.h
@@ -50,7 +50,7 @@ static inline superclock_t superclock_ticks_per_second() { return _superclock_ti
 static inline superclock_t superclock_to_samples (superclock_t s, int sr) { return int_div_round (s * sr, superclock_ticks_per_second()); }
 static inline superclock_t samples_to_superclock (int64_t samples, int sr) { return int_div_round (samples * superclock_ticks_per_second(), superclock_t (sr)); }
 
-extern int most_recent_engine_sample_rate;
+LIBTEMPORAL_API extern int most_recent_engine_sample_rate;
 
 LIBTEMPORAL_API void set_sample_rate (int sr);
 LIBTEMPORAL_API void set_superclock_ticks_per_second (superclock_t sc);