--- a/src/io/graphml.c
+++ b/src/io/graphml.c
@@ -344,7 +344,7 @@
 }
 
 static void igraph_i_graphml_parser_state_set_error_from_xmlerror(
-    struct igraph_i_graphml_parser_state *state, const xmlErrorPtr error
+    struct igraph_i_graphml_parser_state *state, const xmlError *error
 ) {
     const size_t max_error_message_length = 4096;
 
@@ -1530,7 +1530,7 @@
     va_end(args);
 }
 
-static void igraph_i_libxml_structured_error_handler(void* ctx, xmlErrorPtr error) {
+static void igraph_i_libxml_structured_error_handler(void* ctx, const xmlError *error) {
     struct igraph_i_graphml_parser_state* state = (struct igraph_i_graphml_parser_state*) ctx;
     igraph_i_graphml_parser_state_set_error_from_xmlerror(state, error);
 }