diff --git a/library/x509_crl.c b/library/x509_crl.c
index ac4fc75..d2d8042 100644
--- a/library/x509_crl.c
+++ b/library/x509_crl.c
@@ -52,11 +52,13 @@
 #define mbedtls_snprintf   snprintf
 #endif
 
+#if defined(MBEDTLS_HAVE_TIME)
 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
 #include <windows.h>
 #else
 #include <time.h>
 #endif
+#endif
 
 #if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
 #include <stdio.h>
diff --git a/library/x509_crt.c b/library/x509_crt.c
index a6cccf8..911644b 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -63,11 +63,13 @@
 #include "mbedtls/threading.h"
 #endif
 
+#if defined(MBEDTLS_HAVE_TIME)
 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
 #include <windows.h>
 #else
 #include <time.h>
 #endif
+#endif
 
 #if defined(MBEDTLS_FS_IO)
 #include <stdio.h>