diff --git a/main.c b/main.c
index cfac8e9..ed0bc46 100644
--- a/main.c
+++ b/main.c
@@ -265,4 +265,4 @@ int main(int argc, char *argv[]) {
 
   repl();
   return 0;
-}
\ No newline at end of file
+}
diff --git a/r.h b/r.h
index 2956faf..730ebd3 100644
--- a/r.h
+++ b/r.h
@@ -73,7 +73,7 @@ void set_prompt_model(const char *model) {
 
 const char *get_prompt_model() {
   if (_model == NULL && getenv("R_MODEL") != NULL) {
-    _model = getenv("R_MODEL");
+    _model = strdup(getenv("R_MODEL"));
   }
   if (_model) {
     return _model;
diff --git a/rpylib.so b/rpylib.so
index 6b49d71..99c3529 100755
Binary files a/rpylib.so and b/rpylib.so differ