diff --git a/docs/03.API-EXAMPLE.md b/docs/03.API-EXAMPLE.md
index 0c6d689b0..b6c3c633f 100644
--- a/docs/03.API-EXAMPLE.md
+++ b/docs/03.API-EXAMPLE.md
@@ -1084,7 +1084,8 @@ int
 main (void)
 {
   /* Initialize srand value */
-  srand ((unsigned) jerry_port_get_current_time ());
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
 
   /* Generate a random number, and print it */
   const jerry_char_t script[] = "var a = Math.random (); print(a)";
diff --git a/jerry-main/main-unix-test.c b/jerry-main/main-unix-test.c
index 3db77b950..0c8fd9ca4 100644
--- a/jerry-main/main-unix-test.c
+++ b/jerry-main/main-unix-test.c
@@ -72,7 +72,12 @@ int
 main (int argc,
       char **argv)
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union
+  {
+    double d;
+    unsigned u;
+  } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
   if (argc <= 1 || (argc == 2 && (!strcmp ("-h", argv[1]) || !strcmp ("--help", argv[1]))))
   {
     print_help (argv[0]);
diff --git a/jerry-main/main-unix.c b/jerry-main/main-unix.c
index 9cd8b8ff6..913349ea5 100644
--- a/jerry-main/main-unix.c
+++ b/jerry-main/main-unix.c
@@ -467,7 +467,12 @@ int
 main (int argc,
       char **argv)
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union
+  {
+    double d;
+    unsigned u;
+  } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
   JERRY_VLA (const char *, file_names, argc);
   int files_counter = 0;
 
diff --git a/targets/curie_bsp/jerry_app/quark/main.c b/targets/curie_bsp/jerry_app/quark/main.c
index 2aee9143f..2975bbb0b 100644
--- a/targets/curie_bsp/jerry_app/quark/main.c
+++ b/targets/curie_bsp/jerry_app/quark/main.c
@@ -136,7 +136,8 @@ void eval_jerry_script (int argc, char *argv[], struct tcmd_handler_ctx *ctx)
 
 void jerry_start ()
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
   jerry_init (JERRY_INIT_EMPTY);
   jerry_value_t global_obj_val = jerry_get_global_object ();
   jerry_value_t print_func_name_val = jerry_create_string ((jerry_char_t *) "print");
diff --git a/targets/esp8266/user/jerry_run.c b/targets/esp8266/user/jerry_run.c
index ab70ff766..e7fff4c37 100644
--- a/targets/esp8266/user/jerry_run.c
+++ b/targets/esp8266/user/jerry_run.c
@@ -26,7 +26,8 @@ static const char* fn_sys_loop_name = "sysloop";
 
 void js_entry ()
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
 
   jerry_init (JERRY_INIT_EMPTY);
   js_register_functions ();
diff --git a/targets/mbedos5/jerryscript-mbed/jerryscript-mbed-launcher/source/launcher.cpp b/targets/mbedos5/jerryscript-mbed/jerryscript-mbed-launcher/source/launcher.cpp
index 1acf2f169..4c70be883 100644
--- a/targets/mbedos5/jerryscript-mbed/jerryscript-mbed-launcher/source/launcher.cpp
+++ b/targets/mbedos5/jerryscript-mbed/jerryscript-mbed-launcher/source/launcher.cpp
@@ -68,7 +68,8 @@ static int load_javascript() {
 }
 
 int jsmbed_js_init() {
-    srand ((unsigned) jerry_port_get_current_time());
+    union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+    srand (now.u);
     jerry_init_flag_t flags = JERRY_INIT_EMPTY;
     jerry_init(flags);
 
diff --git a/targets/riot-stm32f4/source/main-riotos.c b/targets/riot-stm32f4/source/main-riotos.c
index d77aa274b..28b9df84a 100644
--- a/targets/riot-stm32f4/source/main-riotos.c
+++ b/targets/riot-stm32f4/source/main-riotos.c
@@ -98,7 +98,8 @@ const shell_command_t shell_commands[] = {
 
 int main (void)
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
   printf ("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
   printf ("This board features a(n) %s MCU.\n", RIOT_MCU);
 
diff --git a/targets/zephyr/src/main-zephyr.c b/targets/zephyr/src/main-zephyr.c
index 6ea0b8466..e250f9d39 100644
--- a/targets/zephyr/src/main-zephyr.c
+++ b/targets/zephyr/src/main-zephyr.c
@@ -79,7 +79,8 @@ static int shell_cmd_handler (char *source_buffer)
 
 void main (void)
 {
-  srand ((unsigned) jerry_port_get_current_time ());
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () };
+  srand (now.u);
   uint32_t zephyr_ver = sys_kernel_version_get ();
   printf ("JerryScript build: " __DATE__ " " __TIME__ "\n");
   printf ("JerryScript API %d.%d.%d\n", JERRY_API_MAJOR_VERSION, JERRY_API_MINOR_VERSION, JERRY_API_PATCH_VERSION);
diff --git a/tests/unit-core/test-common.h b/tests/unit-core/test-common.h
index 24c115a66..aaa942d21 100644
--- a/tests/unit-core/test-common.h
+++ b/tests/unit-core/test-common.h
@@ -49,7 +49,8 @@
 #define TEST_INIT() \
 do \
 { \
-  srand ((unsigned) jerry_port_get_current_time ()); \
+  union { double d; unsigned u; } now = { .d = jerry_port_get_current_time () }; \
+  srand (now.u); \
 } while (0)
 
 /**