diff --git a/ssl.c b/ssl.c
index 0d19539..ee5f300 100644
--- a/ssl.c
+++ b/ssl.c
@@ -11,6 +11,7 @@
 #include <ctype.h>
 #include <sys/time.h>
 #include <sys/stat.h>
+#include <alloca.h>
 #include "dirfd.h"
 
 static int library_inited;