diff --git a/c/src/exec/posix/src/pthreadequal.c b/c/src/exec/posix/src/pthreadequal.c
index 083eda0c9f..3ea32bfd1e 100644
--- a/c/src/exec/posix/src/pthreadequal.c
+++ b/c/src/exec/posix/src/pthreadequal.c
@@ -18,6 +18,7 @@
 #include <errno.h>
 
 #include <rtems/system.h>
+#include <rtems/posix/pthread.h>
 #include <rtems/score/thread.h>
 
 int pthread_equal(
diff --git a/cpukit/posix/src/pthreadequal.c b/cpukit/posix/src/pthreadequal.c
index 083eda0c9f..3ea32bfd1e 100644
--- a/cpukit/posix/src/pthreadequal.c
+++ b/cpukit/posix/src/pthreadequal.c
@@ -18,6 +18,7 @@
 #include <errno.h>
 
 #include <rtems/system.h>
+#include <rtems/posix/pthread.h>
 #include <rtems/score/thread.h>
 
 int pthread_equal(