diff --git a/oggenc/platform.c b/oggenc/platform.c

index 6d9f4ef..b66e47a 100644

--- oggenc/platform.c

+++ oggenc/platform.c

@@ -136,18 +136,22 @@ int create_directories(char *fn, int isutf8)

 {

     char *end, *start;

     struct stat statbuf;

-    char *segment = malloc(strlen(fn)+1);

+    const size_t fn_len = strlen(fn);

+    char *segment = malloc(fn_len+1);

 #ifdef _WIN32

     wchar_t seg[MAX_PATH+1];

 #endif

     start = fn;

 #ifdef _WIN32

-    if(strlen(fn) >= 3 && isalpha(fn[0]) && fn[1]==':')

+    // Strip drive prefix

+    if(fn_len >= 3 && isalpha(fn[0]) && fn[1]==':') {

+ 

         start = start+2;

 #endif

-    while((end = strpbrk(start+1, PATH_SEPS)) != NULL)

+    // Loop through path segments, creating directories if necessary

+    while((end = strpbrk(start + strspn(start, PATH_SEPS), PATH_SEPS)) != NULL)

     {

         int rv;

         memcpy(segment, fn, end-fn);