1 files changed, 2 insertions, 0 deletions

diff --git a/src/periodic.h b/src/periodic.h
index 8886617b..3a0501d9 100644
--- a/src/periodic.h
+++ b/src/periodic.h
@@ -21,6 +21,7 @@ ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
 #include <the_Foundation/mutex.h>
+#include <the_Foundation/ptrset.h>
 #include <the_Foundation/sortedarray.h>
 
 iDeclareType(Periodic)
@@ -31,6 +32,7 @@ struct Impl_Periodic {
     iMutex *     mutex;
     iSortedArray commands;
     uint32_t     lastPostTime;
+    iPtrSet      pendingRemoval; /* contexts */
 };
 
 void    init_Periodic   (iPeriodic *);