diff --git a/src/thread/thread.c b/src/thread/thread.c
index 823dfbd..a55f2c4 100644
--- a/src/thread/thread.c
+++ b/src/thread/thread.c
@@ -7,6 +7,7 @@
 #include <sys/queue.h>
 #include <ucontext.h>
 #include <valgrind/valgrind.h>
+#include <errno.h>
 
 #define HAS_STATUS(entry, value) ((entry->status) & (value))
 #define SET_STATUS(entry, value) ((entry->status) |= (value))