diff --git a/platform-specific.inc b/platform-specific.inc
index 207ac8b..9d42534 100644
--- a/platform-specific.inc
+++ b/platform-specific.inc
@@ -120,6 +120,7 @@ static int default_RNG(uint8_t *dest, unsigned size) {
     CryptReleaseContext(prov, 0);
     return 1;
 }
+#define default_RNG_defined 1
 
 #elif defined(unix) || defined(__linux__) || defined(__unix__) || defined(__unix) || \
     (defined(__APPLE__) && defined(__MACH__)) || defined(uECC_POSIX)
@@ -157,12 +158,7 @@ static int default_RNG(uint8_t *dest, unsigned size) {
     close(fd);
     return 1;
 }
-
-#else /* Some other platform */
-
-static int default_RNG(uint8_t *dest, unsigned size) {
-    return 0;
-}
+#define default_RNG_defined 1
 
 #endif /* platform */
 
diff --git a/uECC.c b/uECC.c
index e5336a0..a3bb418 100644
--- a/uECC.c
+++ b/uECC.c
@@ -64,7 +64,11 @@ struct uECC_Curve_t {
     #include "asm_arm_small.inc"
 #endif
 
+#if default_RNG_defined
 static uECC_RNG_Function g_rng_function = &default_RNG;
+#else 
+static uECC_RNG_Function g_rng_function = 0;
+#endif
 
 void uECC_set_rng(uECC_RNG_Function rng_function) {
     g_rng_function = rng_function;
@@ -827,7 +831,7 @@ static void vli_bytesToNative(uint64_t *native, const uint8_t *bytes, uECC_Curve
 static cmpresult_t generate_random_int(uECC_word_t *random,
                                        wordcount_t num_words,
                                        const wordcount_t num_bits) {
-    if (!g_rng_function((uint8_t *)random, num_words * uECC_WORD_SIZE)) {
+    if (!g_rng_function || !g_rng_function((uint8_t *)random, num_words * uECC_WORD_SIZE)) {
         return 0;
     }
     if (num_words * uECC_WORD_SIZE * 8 > num_bits) {
@@ -887,7 +891,7 @@ int uECC_shared_secret(const uint8_t *public_key,
     
     /* If an RNG function was specified, try to get a random initial Z value to improve
        protection against side-channel attacks. */
-    if (g_rng_function != &default_RNG) {
+    if (g_rng_function) {
         for (tries = 0; tries < MAX_TRIES; ++tries) {
             if (!generate_random_int(p2[carry], curve->num_words, curve->num_bytes * 8)) {
                 return 0;
@@ -999,7 +1003,7 @@ static int uECC_sign_with_k(const uint8_t *private_key,
     }
     
     /* Attempt to get a random number to prevent side channel analysis of k. */
-    if (g_rng_function == &default_RNG) {
+    if (!g_rng_function) {
         vli_clear(tmp, curve->num_n_words);
         tmp[0] = 1;
     } else {