diff --git a/src/libCom/osi/os/RTEMS/osiUnistd.h b/src/libCom/osi/os/RTEMS/osiUnistd.h
index 9e9dab38b..d3b73509a 100644
--- a/src/libCom/osi/os/RTEMS/osiUnistd.h
+++ b/src/libCom/osi/os/RTEMS/osiUnistd.h
@@ -38,6 +38,7 @@ extern "C" {
 
 int putenv (char *);
 char *strdup (const char *);
+char *strtok_r(char*, const char*, char**);
 
 int snprintf(char *str, size_t size, const char *format, ...);
 #include <stdarg.h>