diff --git a/include/sys/types.h b/include/sys/types.h
index 25907de15..0eb415186 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -44,7 +44,11 @@
 
 
 
+/* off_t is also defined in unistd.h */
+#ifndef __HAVE_off_t
+#define __HAVE_off_t
 typedef long int off_t;
+#endif
 
 
 
diff --git a/include/unistd.h b/include/unistd.h
index e152f2e88..039775e65 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -49,6 +49,12 @@
 #define STDOUT_FILENO	1
 #define STDERR_FILENO	2
 
+/* We need off_t if sys/types is not included */
+#ifndef __HAVE_off_t
+#define __HAVE_off_t
+typedef long int off_t;
+#endif
+
 
 
 /*****************************************************************************/