diff --git a/Zend/Zend.m4 b/Zend/Zend.m4
index 0c6014bc6474f..d8594874985c8 100644
--- a/Zend/Zend.m4
+++ b/Zend/Zend.m4
@@ -155,7 +155,7 @@ _LT_AC_TRY_DLOPEN_SELF([
 ])
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(getpid kill strtod finite fpclass sigsetjmp)
+AC_CHECK_FUNCS(getpid kill finite fpclass sigsetjmp)
 
 AC_CHECK_DECLS([isfinite, isnan, isinf], [], [], [[#include <math.h>]])