diff --git a/libdispatch/ncexhash.c b/libdispatch/ncexhash.c
index 8a65841e1..b52593ed7 100644
--- a/libdispatch/ncexhash.c
+++ b/libdispatch/ncexhash.c
@@ -285,6 +285,8 @@ exhashlocate(NCexhashmap* map, ncexhashkey_t hkey, NCexleaf** leafp, int* indexp
         /* Is there room in the leaf to add an entry? */
 #if DEBUG >= 3
 	fprintf(stderr,"locate: iter=%d offset=%x leaf=(%d)%p active=%d\n",iter,offset,leaf->uid,leaf,(int)leaf->active);
+#else
+	(void)iter;
 #endif
        if(leaf->active < map->leaflen) break; /* yes, there is room */
        /* Not Enough room, so we need to split this leaf */
diff --git a/libdispatch/ncjson.c b/libdispatch/ncjson.c
index f9bf7680e..6a9b46cc6 100644
--- a/libdispatch/ncjson.c
+++ b/libdispatch/ncjson.c
@@ -1140,5 +1140,5 @@ netcdf_supresswarnings(void)
     ignore = (void*)NCJtotext;
     ignore = (void*)NCJinsertstring;
     ignore = (void*)NCJinsertint;
-    ignore = ignore;
+    (void)ignore;
 }
diff --git a/libnczarr/zplugins.c b/libnczarr/zplugins.c
index 2f7b54852..bc24ad041 100644
--- a/libnczarr/zplugins.c
+++ b/libnczarr/zplugins.c
@@ -759,7 +759,7 @@ printhdf5(const NCZ_HDF5 h)
 static void static_unused(void)
 {
     void* p = NULL;
-    p = p;
+    (void)p;
     p = static_unused;
 #if defined(DEBUGF) || defined(DEBUGL)
 (void)printplugin(NULL);