diff --git a/backends/libyahoo2/yahoo/crypt.c b/backends/libyahoo2/yahoo/crypt.c
index 9e215d8ae1d61f4ff88455e7bfbe57d04f5cadc6..1483ac46a20ff1cd9bb7f0c6f46a460b770095e4 100644
--- a/backends/libyahoo2/yahoo/crypt.c
+++ b/backends/libyahoo2/yahoo/crypt.c
@@ -23,7 +23,11 @@
  * freebsd, crypt works properly on those systems. i hate solaris */
 
 #if HAVE_CONFIG_H
-#  include <config.h>
+# include <config.h>
+#endif
+
+#ifdef __APPLE__
+#define HAVE_STRING_H 1
 #endif
 
 #if HAVE_STRING_H