diff --git a/src/libCom/osi/os/RTEMS/osiUnistd.h b/src/libCom/osi/os/RTEMS/osiUnistd.h
index f280ffb92..87da50649 100644
--- a/src/libCom/osi/os/RTEMS/osiUnistd.h
+++ b/src/libCom/osi/os/RTEMS/osiUnistd.h
@@ -31,5 +31,14 @@
  * There seems to be no way to handle this automatically, so
  * if you get compile errors, just make the appropriate changes here.
  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int putenv (char *);
 char *strdup (const char *);
+
+#ifdef __cplusplus
+}
+#endif