diff --git a/ext/iconv/php_iconv.h b/ext/iconv/php_iconv.h
index d6588868be9..9a25903d187 100644
--- a/ext/iconv/php_iconv.h
+++ b/ext/iconv/php_iconv.h
@@ -93,7 +93,7 @@ typedef enum _php_iconv_err_t {
 } php_iconv_err_t;
 /* }}} */
 
-PHP_ICONV_API php_iconv_err_t php_iconv_string(const char * in_p, size_t in_len, char **out, size_t *out_len, const char *in_charset, const char *out_charset);
+PHP_ICONV_API php_iconv_err_t php_iconv_string(const char * in_p, size_t in_len, char **out, size_t *out_len, const char *out_charset, const char *in_charset);
 
 #else