diff --git a/bindings/pybddisasm/pybddisasm/pybddisasm.c b/bindings/pybddisasm/pybddisasm/pybddisasm.c
index 9a3b1f0..57e2d64 100644
--- a/bindings/pybddisasm/pybddisasm/pybddisasm.c
+++ b/bindings/pybddisasm/pybddisasm/pybddisasm.c
@@ -15,6 +15,7 @@
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
 
+#if _MSC_VER
 int nd_vsnprintf_s(char *buffer, size_t size, size_t count, const char *format, va_list argptr)
 {
     return vsnprintf(buffer, size, format, argptr);
@@ -24,6 +25,7 @@ void * nd_memset(void *s, int c, size_t n)
 {
     return memset(s, c, n);
 }
+#endif
 
 void nd_get_version(ND_UINT32 *major, ND_UINT32 *minor, ND_UINT32 *revision, char **build_date, char **build_time)
 {