diff --git a/src/pl-pro.c b/src/pl-pro.c
index ab05048f4c..5aa6082e4c 100644
--- a/src/pl-pro.c
+++ b/src/pl-pro.c
@@ -846,7 +846,7 @@ check_data(DECL_LD Word p, chk_data *context)
   { Word a = addressIndirect(*p);
 
     assert(!is_marked(p));
-    if ( !((uintptr_t)a&(sizeof(word)-1)) == 0 )
+    if ( (uintptr_t)a & (sizeof(word)-1) )
       printk(context, "Indirect at %p is unaligned", a);
     if ( !onGlobal(a) )
       printk(context, "Indirect at %p not on global stack", a);