diff --git a/cpp/test/include/libc/signal.h b/cpp/test/include/libc/signal.h
index fcc0bf8..8963457 100644
--- a/cpp/test/include/libc/signal.h
+++ b/cpp/test/include/libc/signal.h
@@ -3,6 +3,10 @@
 #ifndef HEADER_SIGNAL_STUB_H
 #define HEADER_SIGNAL_STUB_H
 
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
 #define SIGALRM 14
 #define SIGSEGV 11
 #define SIGTERM 15
@@ -10,7 +14,6 @@
 #define EXIT_FAILURE 2
 #define SA_SIGINFO 4
 
-{} // to silent error from codeql's extractor
 typedef void (*sig_t)(int);
 extern int signal(int, sig_t);
 
@@ -35,6 +38,9 @@ struct sigaction {
 extern int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
 extern int kill(int pid, int sig);
 
+#ifdef  __cplusplus
+}
+#endif
 
 #endif
 
diff --git a/cpp/test/include/libc/string_stubs.h b/cpp/test/include/libc/string_stubs.h
index 9310e50..a5cd662 100644
--- a/cpp/test/include/libc/string_stubs.h
+++ b/cpp/test/include/libc/string_stubs.h
@@ -26,7 +26,7 @@ extern void perror(const char *s);
 
 extern void openlog(const char*, int, int);
 extern void syslog(int, const char*, ...);
-extern void closelog(void)
+extern void closelog(void);
 
 #ifdef  __cplusplus
 }