diff --git a/NEWS b/NEWS
index 39b6e539737..087409db243 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,7 @@ PHP                                                                        NEWS
   . Fixed bug GH-14013 (Erroneous dnl appended in configure). (Peter Kokot)
   . Fixed bug GH-10232 (If autoloading occurs during constant resolution
     filename and lineno are identified incorrectly). (ranvis)
+  . Fixed bug GH-13727 (Missing void keyword). (Peter Kokot)
 
 - Fibers:
   . Fixed bug GH-13903 (ASAN false positive underflow when executing copy()).
diff --git a/build/libtool.m4 b/build/libtool.m4
index 5b518d50e4e..0b9528d7dc7 100644
--- a/build/libtool.m4
+++ b/build/libtool.m4
@@ -4636,7 +4636,7 @@ for ac_symprfx in "" "_"; do
 extern "C" {
 #endif
 char nm_test_var;
-void nm_test_func(){}
+void nm_test_func(void){}
 #ifdef __cplusplus
 }
 #endif