--- Top/threadsafe.c	2018-05-10 10:31:20.000000000 +0200
+++ Top/threadsafe.c	2018-05-13 10:45:03.246526895 +0200
@@ -551,6 +551,7 @@
     csoundSpinLock(lock);
     *pval  = val;
     csoundSpinUnLock(lock);
+    (void)x;
   }
 #endif
 }