diff --git a/configure.ac b/configure.ac
index 215b11946..3a18ec58c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -133,6 +133,9 @@ fi
 #ifdef HAVE_TIME_H
     #include <time.h>
 #endif
+#ifdef HAVE_STDLIB_H
+    #include <stdlib.h>
+#endif
 ]])
 
 AC_PROG_INSTALL