diff --git a/src/xmpp/blocking.c b/src/xmpp/blocking.c
index 766313e0..a272b0c9 100644
--- a/src/xmpp/blocking.c
+++ b/src/xmpp/blocking.c
@@ -33,6 +33,7 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 
 #ifdef HAVE_LIBMESODE
 #include <mesode.h>