diff --git a/ext/io/event/selector/array.h b/ext/io/event/selector/array.h
index 5f44b12..e96197b 100644
--- a/ext/io/event/selector/array.h
+++ b/ext/io/event/selector/array.h
@@ -29,6 +29,8 @@ inline static void IO_Event_Array_allocate(struct IO_Event_Array *array, size_t
 {
 	if (count) {
 		array->base = (void**)calloc(count, sizeof(void*));
+		assert(array->base);
+		
 		array->count = count;
 	} else {
 		array->base = NULL;
@@ -51,6 +53,7 @@ inline static void IO_Event_Array_free(struct IO_Event_Array *array)
 		void *element = array->base[i];
 		if (element) {
 			array->element_free(element);
+			
 			free(element);
 		}
 	}
@@ -107,6 +110,7 @@ inline static void* IO_Event_Array_lookup(struct IO_Event_Array *array, size_t i
 	// Allocate the element if it doesn't exist:
 	if (*element == NULL) {
 		*element = malloc(array->element_size);
+		assert(*element);
 		
 		if (array->element_initialize) {
 			array->element_initialize(*element);
diff --git a/ext/io/event/selector/selector.c b/ext/io/event/selector/selector.c
index 91ff135..3eabfab 100644
--- a/ext/io/event/selector/selector.c
+++ b/ext/io/event/selector/selector.c
@@ -276,6 +276,7 @@ VALUE IO_Event_Selector_raise(struct IO_Event_Selector *backend, int argc, VALUE
 void IO_Event_Selector_queue_push(struct IO_Event_Selector *backend, VALUE fiber)
 {
 	struct IO_Event_Selector_Queue *waiting = malloc(sizeof(struct IO_Event_Selector_Queue));
+	assert(waiting);
 	
 	waiting->head = NULL;
 	waiting->tail = NULL;