diff --git a/cbits/HsUname.c b/cbits/HsUname.c
index ae29dfd..a08199e 100644
--- a/cbits/HsUname.c
+++ b/cbits/HsUname.c
@@ -289,7 +289,7 @@ int unixcompat_os_display_string(char *pszOS, size_t BUFSIZE)
         }
 
         char buf[80];
-        StringCchPrintf(buf, 80, TEXT(" (build %d)"), osvi.dwBuildNumber);
+        StringCchPrintf(buf, 80, TEXT(" (build %ld)"), osvi.dwBuildNumber);
         StringCchCat(pszOS, BUFSIZE, buf);
 
         if (osvi.dwMajorVersion >= 6) {
diff --git a/cbits/mktemp.c b/cbits/mktemp.c
index b9ec050..351d88b 100644
--- a/cbits/mktemp.c
+++ b/cbits/mktemp.c
@@ -47,7 +47,7 @@
 static int random(uint32_t *);
 static int _gettemp(char *, int *);
 
-static const unsigned char padchar[] =
+static const char padchar[] =
 "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
 int unixcompat_mkstemp(char *path)