diff --git a/cmake/CheckWorkingKqueue.cmake b/cmake/CheckWorkingKqueue.cmake
index 47bf4e83..f22f011b 100644
--- a/cmake/CheckWorkingKqueue.cmake
+++ b/cmake/CheckWorkingKqueue.cmake
@@ -17,7 +17,7 @@ main(int argc, char **argv)
     int fd[2];
     struct kevent ev;
     struct timespec ts;
-    char buf[8000];
+    char buf[80000];
 
     if (pipe(fd) == -1)
         exit(1);
@@ -27,7 +27,7 @@ main(int argc, char **argv)
     while ((n = write(fd[1], buf, sizeof(buf))) == sizeof(buf))
         ;
 
-        if ((kq = kqueue()) == -1)
+    if ((kq = kqueue()) == -1)
         exit(1);
 
     memset(&ev, 0, sizeof(ev));
@@ -49,4 +49,4 @@ main(int argc, char **argv)
     exit(0);
 }
 
-" EVENT__HAVE_WORKING_KQUEUE)
\ No newline at end of file
+" EVENT__HAVE_WORKING_KQUEUE)
diff --git a/configure.ac b/configure.ac
index 696c8cd6..e5088ac5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -517,6 +517,12 @@ if test "x$ac_cv_header_sys_event_h" = "xyes"; then
 	if test "x$havekqueue" = "xyes" ; then
 		AC_MSG_CHECKING(for working kqueue)
 		AC_TRY_RUN(
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/event.h>
@@ -532,7 +538,7 @@ main(int argc, char **argv)
 	int fd[[2]];
 	struct kevent ev;
 	struct timespec ts;
-	char buf[[8000]];
+	char buf[[80000]];
 
 	if (pipe(fd) == -1)
 		exit(1);