diff --git a/c/src/exec/posix/src/pthread.c b/c/src/exec/posix/src/pthread.c
index dc6cd59947..f97b3a805d 100644
--- a/c/src/exec/posix/src/pthread.c
+++ b/c/src/exec/posix/src/pthread.c
@@ -13,6 +13,7 @@
 #include <rtems/score/thread.h>
 #include <rtems/score/userext.h>
 #include <rtems/score/wkspace.h>
+#include <rtems/posix/cancel.h>
 #include <rtems/posix/pthread.h>
 #include <rtems/posix/priority.h>
 #include <rtems/posix/psignal.h>
diff --git a/cpukit/posix/src/pthread.c b/cpukit/posix/src/pthread.c
index dc6cd59947..f97b3a805d 100644
--- a/cpukit/posix/src/pthread.c
+++ b/cpukit/posix/src/pthread.c
@@ -13,6 +13,7 @@
 #include <rtems/score/thread.h>
 #include <rtems/score/userext.h>
 #include <rtems/score/wkspace.h>
+#include <rtems/posix/cancel.h>
 #include <rtems/posix/pthread.h>
 #include <rtems/posix/priority.h>
 #include <rtems/posix/psignal.h>