diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index de3182bd8b..9453fc4319 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -274,6 +274,12 @@ def test_openssl():
             raise ValueError('Mozilla CA certs not loaded')
     fprint('SSL OK!')
 
+def test_crt():
+    from ctypes.util import find_msvcrt
+    if not find_msvcrt():
+        raise SystemExit('find_msvcrt() failed')
+    fprint('CRT OK!')
+
 def test():
     if iswindows:
         test_dlls()
@@ -305,6 +311,7 @@ def test():
         test_wpd()
         test_winutil()
         test_file_dialog_helper()
+        test_crt()
     else:
         test_terminal()
     if isosx:
diff --git a/src/calibre/utils/terminal.py b/src/calibre/utils/terminal.py
index 0632803e18..5581e6fcc8 100644
--- a/src/calibre/utils/terminal.py
+++ b/src/calibre/utils/terminal.py
@@ -158,9 +158,9 @@ def crt():
     # We use the C runtime bundled with the calibre windows build
     global _crt
     if _crt is None:
-        import glob, ctypes
-        d = os.path.join(os.path.dirname(sys.executable), '*.CRT', 'msvcr*.dll')
-        _crt = ctypes.CDLL(glob.glob(d)[0])
+        import ctypes
+        from ctypes.util import find_msvcrt
+        _crt = ctypes.CDLL(find_msvcrt())
     return _crt
 
 class ColoredStream(Detect):