diff --git a/src/core/ngx_log.h b/src/core/ngx_log.h
index aae92e7..5952b52 100644
--- a/src/core/ngx_log.h
+++ b/src/core/ngx_log.h
@@ -103,11 +103,12 @@
 
 #define NGX_HAVE_VARIADIC_MACROS  0
 
-void ngx_log_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
+void ngx_cdecl ngx_log_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
     const char *fmt, ...);
 void ngx_log_error_core(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
     const char *fmt, va_list args);
-void ngx_log_debug_core(ngx_log_t *log, ngx_err_t err, const char *fmt, ...);
+void ngx_cdecl ngx_log_debug_core(ngx_log_t *log, ngx_err_t err,
+    const char *fmt, ...);
 
 
 #endif /* VARIADIC MACROS */