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-rw-r--r--src/env.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/env.c b/src/env.c
index 045c4eeb..2439d1b6 100644
--- a/src/env.c
+++ b/src/env.c
@@ -120,9 +120,11 @@ serd_env_add(SerdEnv* env,
const char* name_str = serd_node_get_string(name);
SerdPrefix* const prefix = serd_env_find(env, name_str, name->n_bytes);
if (prefix) {
- SerdNode* old_prefix_uri = prefix->uri;
- prefix->uri = serd_node_copy(uri);
- serd_node_free(old_prefix_uri);
+ if (!serd_node_equals(prefix->uri, uri)) {
+ SerdNode* old_prefix_uri = prefix->uri;
+ prefix->uri = serd_node_copy(uri);
+ serd_node_free(old_prefix_uri);
+ }
} else {
env->prefixes = (SerdPrefix*)realloc(
env->prefixes, (++env->n_prefixes) * sizeof(SerdPrefix));