diff --git a/libraries/tests/mbed/stdio/main.cpp b/libraries/tests/mbed/stdio/main.cpp
index 0b2445de9b..bdfd53c976 100644
--- a/libraries/tests/mbed/stdio/main.cpp
+++ b/libraries/tests/mbed/stdio/main.cpp
@@ -15,9 +15,8 @@ int main() {
     DigitalOut led1(LED1);
     DigitalOut led2(LED2);
 
-    union {
-        int value_int;
-    };
+    int value_int;
+    
 
     notify_start(); // Just to sync with host test supervisor