diff --git a/tests/common.pl b/tests/common.pl
index d997114..3a14e36 100755
--- a/tests/common.pl
+++ b/tests/common.pl
@@ -1,3 +1,16 @@
+# Portable FUSE unmount
+# works on Linux AND OSX
+sub portable_unmount {
+    my $crypt = shift;
+    my $fusermount = qx(which fusermount);
+    chomp($fusermount);
+    if(-f $fusermount) {
+        qx($fusermount -u "$crypt");
+    } else {
+        qx(umount "$crypt");
+    }
+}
+
 # Helper function
 # Get the MD5 sum of the file open at the filehandle
 use Digest::MD5 qw(md5_hex);
diff --git a/tests/normal.t.pl b/tests/normal.t.pl
index 7f0d779..b38a19d 100755
--- a/tests/normal.t.pl
+++ b/tests/normal.t.pl
@@ -316,15 +316,7 @@ sub mount
 # Unmount and delete mountpoint
 sub cleanup
 {
-    my $fusermount = qx(which fusermount);
-    chomp($fusermount);
-    if(-f $fusermount)
-    {
-        qx($fusermount -u "$crypt");
-    } else
-    {
-        qx(umount "$crypt");
-    }
+    portable_unmount($crypt);
 
     rmdir $crypt;
     ok( ! -d $crypt, "unmount ok, mount point removed");
diff --git a/tests/reverse.t.pl b/tests/reverse.t.pl
index 35a98b8..b7f9196 100755
--- a/tests/reverse.t.pl
+++ b/tests/reverse.t.pl
@@ -32,8 +32,8 @@ sub newWorkingDir
 # Unmount and delete mountpoint
 sub cleanup
 {
-    system("fusermount -u $decrypted");
-    system("fusermount -u $ciphertext");
+    portable_unmount($decrypted);
+    portable_unmount($ciphertext);
     our $workingDir;
     rmtree($workingDir);
     ok( ! -d $workingDir, "working dir removed");