diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index 039cb58..fc3672c 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -237,6 +237,8 @@
 #if defined(MBEDTLS_PLATFORM_TIME_TYPE_MACRO)
 typedef MBEDTLS_PLATFORM_TIME_TYPE_MACRO mbedtls_time_t;
 #else
+/* For time_t */
+#include <time.h>
 typedef time_t mbedtls_time_t;
 #endif /* MBEDTLS_PLATFORM_TIME_TYPE_MACRO */
 
diff --git a/library/error.c b/library/error.c
index debda1d..4718b51 100644
--- a/library/error.c
+++ b/library/error.c
@@ -34,6 +34,7 @@
 #include "mbedtls/platform.h"
 #else
 #define mbedtls_snprintf snprintf
+#define mbedtls_time_t   time_t
 #endif
 
 #if defined(MBEDTLS_ERROR_C)
diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index b37eb83..14fb612 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -31,6 +31,7 @@
 #include <stdio.h>
 #define mbedtls_printf     printf
 #define mbedtls_fprintf    fprintf
+#define mbedtls_time_t     time_t
 #endif
 
 #if !defined(MBEDTLS_SSL_CLI_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index df0fc78..1d6eb3b 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -31,6 +31,7 @@
 #include <stdio.h>
 #define mbedtls_printf     printf
 #define mbedtls_fprintf    fprintf
+#define mbedtls_time_t     time_t
 #endif
 
 #if !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_SSL_PROTO_DTLS) ||    \
diff --git a/scripts/data_files/error.fmt b/scripts/data_files/error.fmt
index bd6ef01..a08742c 100644
--- a/scripts/data_files/error.fmt
+++ b/scripts/data_files/error.fmt
@@ -34,6 +34,7 @@
 #include "mbedtls/platform.h"
 #else
 #define mbedtls_snprintf snprintf
+#define mbedtls_time_t   time_t
 #endif
 
 #if defined(MBEDTLS_ERROR_C)