--- a/bindings/xml/expat_xmlparser.c
+++ b/bindings/xml/expat_xmlparser.c
@@ -484,7 +484,7 @@
 
 	UNUSED(int_enc);
 
-	parser = calloc(sizeof(*parser), 1);
+	parser = calloc(1, sizeof(*parser));
 	if (parser == NULL) {
 		msg(DOM_MSG_CRITICAL, mctx, "No memory for parser");
 		return NULL;
--- a/src/core/node.c
+++ b/src/core/node.c
@@ -2379,7 +2379,7 @@
 	if (t == NULL) {
 		/* Create the event target list */
 		size = 64;
-		t = calloc(sizeof(*t), size);
+		t = calloc(size, sizeof(*t));
 		if (t == NULL) {
 			return DOM_NO_MEM_ERR;
 		}
--- a/src/html/html_document.c
+++ b/src/html/html_document.c
@@ -134,13 +134,12 @@
 	doc->cookie = NULL;
 	doc->body = NULL;
 
-	doc->memoised = calloc(sizeof(dom_string *), hds_COUNT);
+	doc->memoised = calloc(hds_COUNT, sizeof(dom_string *));
 	if (doc->memoised == NULL) {
 		error = DOM_NO_MEM_ERR;
 		goto out;
 	}
-	doc->elements = calloc(sizeof(dom_string *),
-			DOM_HTML_ELEMENT_TYPE__COUNT);
+	doc->elements = calloc(DOM_HTML_ELEMENT_TYPE__COUNT, sizeof(dom_string *));
 	if (doc->elements == NULL) {
 		error = DOM_NO_MEM_ERR;
 		goto out;