diff -Naur a/src/rdf_parser.c b/src/rdf_parser.c
--- a/src/rdf_parser.c	2024-07-12 11:25:43.699551420 +0800
+++ b/src/rdf_parser.c	2024-07-12 11:25:57.519551420 +0800
@@ -1010,7 +1010,7 @@
 "    <dc:creator>Dave Beckett</dc:creator>\n" \
 "    <dc:description>The generic home page of Dave Beckett.</dc:description>\n" \
 "  </rdf:Description>\n" \
-"</rdf:RDF>"
+"</rdf:RDF>\n"
 
 #define NTRIPLES_CONTENT \
 "<http://purl.org/net/dajobe/> <http://purl.org/dc/elements/1.1/creator> \"Dave Beckett\" .\n" \
@@ -1138,11 +1138,11 @@
     }
 
 
+    fprintf(stderr, "%s: Adding %s string content as stream\n", program, type);
     stream = librdf_parser_parse_string_as_stream(parser,
                                                   file_content[testi],
                                                   uris[testi]);
     if(!stream) {
-    fprintf(stderr, "%s: Adding %s string content as stream\n", program, type);
       fprintf(stderr, "%s: Failed to parse RDF from string %d as stream\n",
               program, testi);
       failures++;
@@ -1161,6 +1161,10 @@
       goto tidy_test;
     }
 
+    if (parser) {
+      librdf_free_parser(parser);
+    }
+    parser = librdf_new_parser(world, type, NULL, NULL);
 
     fprintf(stderr, "%s: Adding %s as iostream, as stream\n", program, type);
     iostream = raptor_new_iostream_from_string(world->raptor_world_ptr,
@@ -1190,6 +1194,10 @@
       goto tidy_test;
     }
 
+    if (parser) {
+      librdf_free_parser(parser);
+    }
+    parser = librdf_new_parser(world, type, NULL, NULL);
 
     fprintf(stderr, "%s: Adding %s counted string content\n", program, type);
     if(librdf_parser_parse_counted_string_into_model(parser,
@@ -1212,6 +1220,11 @@
       goto tidy_test;
     }
 
+    if (parser) {
+      librdf_free_parser(parser);
+    }
+    parser = librdf_new_parser(world, type, NULL, NULL);
+
 
     fprintf(stderr, "%s: Adding %s string content\n", program, type);
     if(librdf_parser_parse_string_into_model(parser,
@@ -1245,6 +1258,11 @@
     }
 
     /* test parsing iostream */
+    if (parser) {
+      librdf_free_parser(parser);
+    }
+    parser = librdf_new_parser(world, type, NULL, NULL);
+
     fprintf(stderr, "%s: Adding %s iostream content\n", program, type);
     iostream = raptor_new_iostream_from_string(world->raptor_world_ptr,
                                                (void *)file_content[testi],