diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..367ccba
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+water.test
diff --git a/if.go b/if.go
index 965f2ac..d008f78 100644
--- a/if.go
+++ b/if.go
@@ -53,6 +53,9 @@ func New(config Config) (ifce *Interface, err error) {
 	if zeroConfig == config {
 		config = defaultConfig()
 	}
+	if config.PlatformSpecificParams == zeroConfig.PlatformSpecificParams {
+		config.PlatformSpecificParams = defaultPlatformSpecificParams()
+	}
 	switch config.DeviceType {
 	case TUN:
 		return newTUN(config)
diff --git a/syscalls_darwin.go b/syscalls_darwin.go
index c998557..8e8e350 100644
--- a/syscalls_darwin.go
+++ b/syscalls_darwin.go
@@ -175,7 +175,7 @@ func (t *tunReadCloser) Write(from []byte) (int, error) {
 	} else if ipVer == 6 {
 		t.wBuf[3] = syscall.AF_INET6
 	} else {
-		return 0, errors.New("Unable to determine IP version from packet.")
+		return 0, errors.New("Unable to determine IP version from packet")
 	}
 
 	copy(t.wBuf[4:], from)