diff --git a/kimgio/jp2.cpp b/kimgio/jp2.cpp
index 9ae7d3a89..1f3f09c0a 100644
--- a/kimgio/jp2.cpp
+++ b/kimgio/jp2.cpp
@@ -2,7 +2,7 @@
 #include "config.h"
 
 #ifdef HAVE_JASPER
-
+#include <unistd.h>
 #include "jp2.h"
 
 #if !defined(__STDC_LIMIT_MACROS)