diff --git a/libobs/obs-internal.h b/libobs/obs-internal.h
index 1766abb01..13e8c7ed1 100644
--- a/libobs/obs-internal.h
+++ b/libobs/obs-internal.h
@@ -554,6 +554,12 @@ static inline bool obs_weak_ref_get_ref(struct obs_weak_ref *ref)
 	return false;
 }
 
+static inline bool obs_weak_ref_expired(struct obs_weak_ref *ref)
+{
+	long owners = os_atomic_load_long(&ref->refs);
+	return owners < 0;
+}
+
 /* ------------------------------------------------------------------------- */
 /* sources  */
 
diff --git a/libobs/obs-source.c b/libobs/obs-source.c
index 5db687b99..02d47606f 100644
--- a/libobs/obs-source.c
+++ b/libobs/obs-source.c
@@ -774,6 +774,11 @@ obs_source_t *obs_weak_source_get_source(obs_weak_source_t *weak)
 	return NULL;
 }
 
+bool obs_weak_source_expired(obs_weak_source_t *weak)
+{
+	return weak ? obs_weak_ref_expired(&weak->ref) : true;
+}
+
 bool obs_weak_source_references_source(obs_weak_source_t *weak,
 				       obs_source_t *source)
 {
diff --git a/libobs/obs.h b/libobs/obs.h
index 30f6d11af..7d0924938 100644
--- a/libobs/obs.h
+++ b/libobs/obs.h
@@ -900,6 +900,7 @@ EXPORT void obs_weak_source_release(obs_weak_source_t *weak);
 EXPORT obs_source_t *obs_source_get_ref(obs_source_t *source);
 EXPORT obs_weak_source_t *obs_source_get_weak_source(obs_source_t *source);
 EXPORT obs_source_t *obs_weak_source_get_source(obs_weak_source_t *weak);
+EXPORT bool obs_weak_source_expired(obs_weak_source_t *weak);
 
 EXPORT bool obs_weak_source_references_source(obs_weak_source_t *weak,
 					      obs_source_t *source);