--- src/webpng.c
+++ src/webpng.c
@@ -19,7 +19,7 @@
 
 /* Bring in the gd library functions */
 #include "gd.h"
-
+#include <getopt.h>
 #define KEEP_TRANS (-100)
 
 static const char argv0[] = "webpng";
@@ -64,7 +64,7 @@
 	FILE *in;
 	FILE *out;
 	const char *infile;
-	char *tmpfile;
+	char *tmppath;
 	int i;
 	int use_stdin_stdout = 0;
 
@@ -258,19 +258,24 @@
 		size_t len = filelen + 8;
 		int outfd;
 
-		tmpfile = malloc(len);
-		if (tmpfile == NULL)
+#ifdef _MSC_VER
+        out = tmpfile();
+		if (out == NULL)
+			err("could not create temporary file");
+#else
+		tmppath = malloc(len);
+		if (tmppath == NULL)
 			err("could not create a tempfile");
-		memcpy(tmpfile, infile, filelen);
-		strcpy(tmpfile + filelen, ".XXXXXX");
-
-		outfd = mkstemp(tmpfile);
+		memcpy(tmppath, infile, filelen);
+		strcpy(tmppath + filelen, ".XXXXXX");
+		tmpnam(tmppath);
+		outfd = mkstemp(tmppath);
 		if (outfd == -1)
-			err("could not open %s", tmpfile);
-
+			err("could not open %s", tmppath);
 		out = fdopen(outfd, "wb");
 		if (!out)
-			err("could not open %s", tmpfile);
+			err("could not open %s", tmppath);
+#endif
 	}
 
 	/* Write the new PNG. */