diff --git a/Ibm1130/utils/asm1130.c b/Ibm1130/utils/asm1130.c
index 03e806eac..8389d25bf 100644
--- a/Ibm1130/utils/asm1130.c
+++ b/Ibm1130/utils/asm1130.c
@@ -157,7 +157,7 @@
  * Comment out this define to make @ and ' different in symbol names, keep to make equivalent
  */
 
-#if defined(VMS)
+#if defined(__linux) || defined(VMS)
     #  include <unistd.h>                   /* to pick up 'unlink' */
 #endif