diff --git a/source/wildmatch.d b/source/wildmatch.d
index c41d605..b3565d2 100644
--- a/source/wildmatch.d
+++ b/source/wildmatch.d
@@ -1,6 +1,6 @@
 module wildmatch;
 
-import std.string : fromStringz;
+import std.string : fromStringz, toStringz;
 import std.conv : to;
 
 extern(C):
@@ -29,6 +29,8 @@ alias WM_FILE_NAME  = WM_PATHNAME;
  */
 private int wildmatch(const(char)* pattern, const(char)* str, int flags);
 
-bool dwildmatch(string pattern, string str, int flags = WM_PATHNAME) {
-	return wildmatch(pattern.ptr, str.ptr, flags) == WM_MATCH;
+bool dwildmatch(const string pattern, const string str, int flags = WM_PATHNAME) {
+	auto patternZ = pattern.toStringz();
+	auto strZ = str.toStringz();
+	return wildmatch(patternZ, strZ, flags) == WM_MATCH;
 }