diff --git a/ext/standard/dl.c b/ext/standard/dl.c
index 04e349577b0..1de8867a6e2 100644
--- a/ext/standard/dl.c
+++ b/ext/standard/dl.c
@@ -52,7 +52,7 @@
 
 /* {{{ proto int dl(string extension_filename) U
    Load a PHP extension at runtime */
-PHP_FUNCTION(dl)
+PHPAPI PHP_FUNCTION(dl)
 {
 	char *filename;
 	int filename_len;