diff --git a/tests/configs/config-wrapper-malloc-0-null.h b/tests/configs/config-wrapper-malloc-0-null.h
index b065c2d..fc649bf 100644
--- a/tests/configs/config-wrapper-malloc-0-null.h
+++ b/tests/configs/config-wrapper-malloc-0-null.h
@@ -23,11 +23,12 @@
 #include <stdlib.h>
 
 #ifndef MBEDTLS_PLATFORM_STD_CALLOC
-static inline void *custom_calloc( size_t nmemb, size_t size )
+static inline void *custom_calloc(size_t nmemb, size_t size)
 {
-    if( nmemb == 0 || size == 0 )
-        return( NULL );
-    return( calloc( nmemb, size ) );
+    if (nmemb == 0 || size == 0) {
+        return NULL;
+    }
+    return calloc(nmemb, size);
 }
 
 #define MBEDTLS_PLATFORM_MEMORY