diff --git a/Zend/zend_operators.c b/Zend/zend_operators.c
index bcfe30c6f8e..abca0a98a34 100644
--- a/Zend/zend_operators.c
+++ b/Zend/zend_operators.c
@@ -32,10 +32,12 @@
 #include "zend_list.h"
 #include "zend_fast_cache.h"
 
-#ifndef HAVE_FINITE
+#if !HAVE_FINITE
 #ifndef finite  				/* in case it's already a macro */
 #define finite(a) isfinite(a)	/* HPUX 11 only has isfinite() */
 #endif
+#else
+#include <ieeefp.h>
 #endif
 
 #if WITH_BCMATH