diff --git a/dlls/crypt32/tests/encode.c b/dlls/crypt32/tests/encode.c
index eae128210be..8cb384c3395 100644
--- a/dlls/crypt32/tests/encode.c
+++ b/dlls/crypt32/tests/encode.c
@@ -476,7 +476,7 @@ static void testTimeEncoding(DWORD dwEncoding, LPCSTR structType,
 
 static const char *printSystemTime(const SYSTEMTIME *st)
 {
-    static char buf[25];
+    static char buf[64];
 
     sprintf(buf, "%02d-%02d-%04d %02d:%02d:%02d.%03d", st->wMonth, st->wDay,
      st->wYear, st->wHour, st->wMinute, st->wSecond, st->wMilliseconds);
@@ -485,7 +485,7 @@ static const char *printSystemTime(const SYSTEMTIME *st)
 
 static const char *printFileTime(const FILETIME *ft)
 {
-    static char buf[25];
+    static char buf[64];
     SYSTEMTIME st;
 
     FileTimeToSystemTime(ft, &st);