diff --git a/src/pipewire/array.h b/src/pipewire/array.h
index 0bb7153ec..af05f5d36 100644
--- a/src/pipewire/array.h
+++ b/src/pipewire/array.h
@@ -63,8 +63,9 @@ struct pw_array {
 	     (pos)++)
 
 #define pw_array_remove(a,p)						\
+	(a)->size -= sizeof(*(p));					\
 	memmove(p, SPA_MEMBER((p), sizeof(*(p)), void),			\
-                SPA_PTRDIFF((p), pw_array_end(a)) - sizeof(*(p)));
+                SPA_PTRDIFF(pw_array_end(a),(p)));
 
 
 /** Initialize the array with given extend \memberof pw_array */