diff --git a/backends/libyahoo2/yahoo/yahoo_util.c b/backends/libyahoo2/yahoo/yahoo_util.c
index add6d81abc65ec933c3df466a1f99192a5c3107d..92e8d31e95d4a07836e8888f759cb129c29b9fcb 100644
--- a/backends/libyahoo2/yahoo/yahoo_util.c
+++ b/backends/libyahoo2/yahoo/yahoo_util.c
@@ -23,6 +23,10 @@
 # include <config.h>
 #endif
 
+#if __APPLE__
+#define STDC_HEADERS 1
+#endif
+
 #if STDC_HEADERS
 # include <string.h>
 #else