diff --git a/include/zephyr/posix/fcntl.h b/include/zephyr/posix/fcntl.h
index 874f3ee08f8dde..9689d1ae8c3fbf 100644
--- a/include/zephyr/posix/fcntl.h
+++ b/include/zephyr/posix/fcntl.h
@@ -27,7 +27,15 @@
 #define F_GETFL 3
 #define F_SETFL 4
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int open(const char *name, int flags, ...);
 int fcntl(int fildes, int cmd, ...);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ZEPHYR_POSIX_FCNTL_H_ */
diff --git a/include/zephyr/posix/net/if.h b/include/zephyr/posix/net/if.h
index 67d42800225fe1..a8d6183cf80467 100644
--- a/include/zephyr/posix/net/if.h
+++ b/include/zephyr/posix/net/if.h
@@ -8,4 +8,12 @@
 
 #include <zephyr/net/socket.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ZEPHYR_INCLUDE_POSIX_NET_IF_H_ */
diff --git a/include/zephyr/posix/netinet/tcp.h b/include/zephyr/posix/netinet/tcp.h
index a5f50ab741242d..775fe992b02e55 100644
--- a/include/zephyr/posix/netinet/tcp.h
+++ b/include/zephyr/posix/netinet/tcp.h
@@ -8,4 +8,12 @@
 
 #include <zephyr/net/socket.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* ZEPHYR_INCLUDE_POSIX_NETINET_TCP_H_ */