diff --git a/backends/libyahoo2/yahoo/libyahoo2.c b/backends/libyahoo2/yahoo/libyahoo2.c
index f33f1365dd7b99409e8b9f0f06db431cd9c307d0..46b487cc349279c63a2eed45d25e2b6aa6a85b02 100644
--- a/backends/libyahoo2/yahoo/libyahoo2.c
+++ b/backends/libyahoo2/yahoo/libyahoo2.c
@@ -51,6 +51,10 @@
 # include <config.h>
 #endif
 
+#if __APPLE__
+#define STDC_HEADERS 1
+#endif
+
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif