diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index de3d71d9dc..95eb6d9dc1 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -385,6 +385,31 @@ int mbedtls_platform_set_exit(void (*exit_func)(int status));
 #define MBEDTLS_EXIT_FAILURE 1
 #endif
 
+#if defined(MBEDTLS_ENTROPY_C) && \
+    !defined(MBEDTLS_NO_PLATFORM_ENTROPY) && \
+    !(defined(_WIN32) && !defined(EFIX64) && !defined(EFI32))
+/* Platforms where MBEDTLS_PLATFORM_DEV_RANDOM is used
+ * unless a dedicated system call is available both at
+ * compile time and at run time. */
+#define MBEDTLS_PLATFORM_HAVE_DEV_RANDOM
+#endif
+
+#if !defined(MBEDTLS_PLATFORM_DEV_RANDOM)
+#define MBEDTLS_PLATFORM_DEV_RANDOM "/dev/urandom"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_HAVE_DEV_RANDOM)
+/**
+ * Path to a special file that returns cryptographic-quality random bytes
+ * when read. This is used by the default platform entropy source on
+ * non-Windows platforms unless a dedicated system call is available
+ * (see #MBEDTLS_NO_PLATFORM_ENTROPY).
+ *
+ * The default value is #MBEDTLS_PLATFORM_DEV_RANDOM.
+ */
+extern const char *mbedtls_platform_dev_random;
+#endif
+
 /*
  * The function pointers for reading from and writing a seed file to
  * Non-Volatile storage (NV) in a platform-independent way
diff --git a/library/entropy_poll.c b/library/entropy_poll.c
index 611768cd85..1c8a29d6e2 100644
--- a/library/entropy_poll.c
+++ b/library/entropy_poll.c
@@ -147,6 +147,8 @@ static int sysctl_arnd_wrapper(unsigned char *buf, size_t buflen)
 
 #include <stdio.h>
 
+const char *mbedtls_platform_dev_random = MBEDTLS_PLATFORM_DEV_RANDOM;
+
 int mbedtls_platform_entropy_poll(void *data,
                                   unsigned char *output, size_t len, size_t *olen)
 {
@@ -180,7 +182,7 @@ int mbedtls_platform_entropy_poll(void *data,
 
     *olen = 0;
 
-    file = fopen("/dev/urandom", "rb");
+    file = fopen(mbedtls_platform_dev_random, "rb");
     if (file == NULL) {
         return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
     }