diff --git a/cpukit/score/inline/rtems/score/schedulerpriority.inl b/cpukit/score/inline/rtems/score/schedulerpriority.inl
index fc108d6ae5..393ee09062 100644
--- a/cpukit/score/inline/rtems/score/schedulerpriority.inl
+++ b/cpukit/score/inline/rtems/score/schedulerpriority.inl
@@ -25,6 +25,7 @@
 #define _RTEMS_SCORE_SCHEDULERPRIORITY_INL
 
 #include <rtems/score/chainimpl.h>
+#include <rtems/score/thread.h>
 #include <rtems/score/wkspace.h>
 
 /**