diff --git a/src/mtagmap.lisp b/src/mtagmap.lisp
index 5107258..85733ea 100644
--- a/src/mtagmap.lisp
+++ b/src/mtagmap.lisp
@@ -136,7 +136,11 @@
 		     (mtagmap-fd mtagmap) fd
 		     (mtagmap-ptr mtagmap) ptr
 		     (mtagmap-len mtagmap) bytes
-		     fd nil ptr nil))
+		     fd nil ptr nil)
+		    #-linux
+		    (setf
+		     (mtagmap-protection mtagmap) protection
+		     (mtagmap-sharing mtagmap) sharing) )
 	       (when ptr 
 		 (osicat-posix:munmap ptr bytes)))))
       (when fd 
@@ -151,7 +155,15 @@
 	     (osicat-posix:ftruncate (mtagmap-fd mtagmap) new-len))
 	   (remap ()
 	     (setf (mtagmap-ptr mtagmap)
+		   #+linux
 		   (osicat-posix:mremap (mtagmap-ptr mtagmap) len new-len osicat-posix:MREMAP-MAYMOVE)
+		   #-linux
+		   (let ((ptr (mtagmap-ptr mtagmap))
+			 (fd (mtagmap-fd mtagmap))
+			 (protection (mtagmap-protection mtagmap))
+			 (sharing (mtagmap-sharing mtagmap)))
+		     (assert (zerop (osicat-posix:munmap ptr len)))
+		     (osicat-posix:mmap (cffi:null-pointer) new-len protection sharing fd 0))
 		   len new-len)))
       (let (done)
 	(unwind-protect
diff --git a/src/struct.lisp b/src/struct.lisp
index 9a282f6..7bc5a5c 100644
--- a/src/struct.lisp
+++ b/src/struct.lisp
@@ -81,6 +81,9 @@ Remains constant across remappings of the memory mapped regions to different off
   (ptr (cffi:null-pointer) :type machine-pointer)
   (len 0 :type mindex)
 
+  #-linux protection
+  #-linux sharing
+
   class
   layout
   instantiator
diff --git a/t/symbol.lisp b/t/symbol.lisp
index 413f9df..ac32789 100644
--- a/t/symbol.lisp
+++ b/t/symbol.lisp
@@ -28,11 +28,11 @@
 		   (setf (gethash sym table) mptr))))
 	 (do-all-syms (sym)
 	   (add sym (lisp-object-to-mptr sym)))
-	 (iter (for (sym mptr) in table)
+	 (iter (for (sym mptr) in-hashtable table)
 	       (stefil:is (= mptr (lisp-object-to-mptr sym))))
 	 (do-all-syms (sym)
 	   (stefil:is (eq sym (mptr-to-lisp-object (lisp-object-to-mptr sym)))))
-	 (iter (for (sym mptr) in table)
+	 (iter (for (sym mptr) in-hashtable table)
 	       (stefil:is (eq sym (mptr-to-lisp-object mptr))))
 	 (do-all-syms (sym)
 	   (add sym (lisp-object-to-mptr sym))))))))