diff --git a/headers/posix/iconv.h b/headers/posix/iconv.h
index eec66af28b..f4904071a8 100644
--- a/headers/posix/iconv.h
+++ b/headers/posix/iconv.h
@@ -3,7 +3,7 @@
 /* 
 ** Distributed under the terms of the OpenBeOS License.
 */
-
+#include <size_t.h>
 
 typedef void *iconv_t;