diff --git a/src/libssh2_priv.h b/src/libssh2_priv.h
index b0a44bc7..3e02cf18 100644
--- a/src/libssh2_priv.h
+++ b/src/libssh2_priv.h
@@ -135,6 +135,7 @@
 /* Use local implementation when not available */
 #if !defined(HAVE_SNPRINTF)
 #define LIBSSH2_SNPRINTF
+#undef snprintf
 #define snprintf _libssh2_snprintf
 int _libssh2_snprintf(char *cp, size_t cp_max_len, const char *fmt, ...);
 #endif