diff --git a/test/test-fs-copyfile.c b/test/test-fs-copyfile.c
index eadff542..7b6511c9 100644
--- a/test/test-fs-copyfile.c
+++ b/test/test-fs-copyfile.c
@@ -23,7 +23,8 @@
 #include "task.h"
 
 #if defined(__unix__) || defined(__POSIX__) || \
-    defined(__APPLE__) || defined(_AIX) || defined(__MVS__)
+    defined(__APPLE__) || defined(__sun) || \
+    defined(_AIX) || defined(__MVS__)
 #include <unistd.h> /* unlink, etc. */
 #else
 # include <direct.h>
diff --git a/test/test-fs.c b/test/test-fs.c
index e3f11373..35f7d0c3 100644
--- a/test/test-fs.c
+++ b/test/test-fs.c
@@ -30,7 +30,8 @@
 
 /* FIXME we shouldn't need to branch in this file */
 #if defined(__unix__) || defined(__POSIX__) || \
-    defined(__APPLE__) || defined(_AIX) || defined(__MVS__)
+    defined(__APPLE__) || defined(__sun) || \
+    defined(_AIX) || defined(__MVS__)
 #include <unistd.h> /* unlink, rmdir, etc. */
 #else
 # include <winioctl.h>