diff --git a/clamdscan/client.c b/clamdscan/client.c
index 50cf0abe0..147f16aeb 100644
--- a/clamdscan/client.c
+++ b/clamdscan/client.c
@@ -21,7 +21,9 @@
 #endif
 
 #include <stdio.h>
+#ifdef	HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>