diff --git a/cpu/native/syscalls.c b/cpu/native/syscalls.c
index 77e7e0d48c..01bc226c17 100644
--- a/cpu/native/syscalls.c
+++ b/cpu/native/syscalls.c
@@ -320,6 +320,7 @@ void err(int eval, const char *fmt, ...)
     va_list argp;
     va_start(argp, fmt);
     verr(eval, fmt, argp);
+    va_end(argp);
 }
 
 void errx(int eval, const char *fmt, ...)
@@ -327,6 +328,7 @@ void errx(int eval, const char *fmt, ...)
     va_list argp;
     va_start(argp, fmt);
     verrx(eval, fmt, argp);
+    va_end(argp);
 }
 
 int getpid(void)