diff --git a/cpukit/posix/src/ptimer.c b/cpukit/posix/src/ptimer.c
index 2d0316484e..2f0a5d5559 100644
--- a/cpukit/posix/src/ptimer.c
+++ b/cpukit/posix/src/ptimer.c
@@ -9,6 +9,7 @@
 #include <assert.h>
 #include <time.h>
 #include <errno.h>
+#include <limits.h> /* _POSIX_PATH_MAX */
 
 #include <rtems/system.h>
 #include <rtems/score/isr.h>