diff --git a/queue.c b/queue.c
index 452e8e6..f8a9233 100644
--- a/queue.c
+++ b/queue.c
@@ -9,6 +9,8 @@
 
 #include <assert.h>
 
+#include <ucontext.h>
+
 /* OSSP UUID */
 #include <uuid.h>