diff --git a/Zend/zend_compile.c b/Zend/zend_compile.c
index 65a183efdc7..edde8746e97 100644
--- a/Zend/zend_compile.c
+++ b/Zend/zend_compile.c
@@ -1023,7 +1023,7 @@ void do_return(znode *expr, int do_end_vparse CLS_DC)
 }
 
 
-void function_add_ref(zend_function *function)
+ZEND_API void function_add_ref(zend_function *function)
 {
 	if (function->type == ZEND_USER_FUNCTION) {
 		zend_op_array *op_array = &function->op_array;
diff --git a/Zend/zend_compile.h b/Zend/zend_compile.h
index b89ae9daa90..4bb716cc8bb 100644
--- a/Zend/zend_compile.h
+++ b/Zend/zend_compile.h
@@ -365,7 +365,7 @@ void do_extended_fcall_end(CLS_D);
 
 void do_ticks(CLS_D);
 
-void function_add_ref(zend_function *function);
+ZEND_API void function_add_ref(zend_function *function);
 
 #define INITIAL_OP_ARRAY_SIZE 64