diff --git a/inst/include/torch_imports.h b/inst/include/torch_imports.h
index 0aeaf24e29..ac5f1d981d 100644
--- a/inst/include/torch_imports.h
+++ b/inst/include/torch_imports.h
@@ -223,9 +223,9 @@ XPtrTorchOptionalIntArrayRef from_sexp_optional_int_array_ref(SEXP x,
 }
 
 void* fixme_new_string(const char* x, int size) {
-  static void* (*fn)(const char*) = NULL;
+  static void* (*fn)(const char*, int) = NULL;
   if (fn == NULL) {
-    fn = (void* (*)(const char*))R_GetCCallable("torch", "fixme_new_string");
+    fn = (void* (*)(const char*, int))R_GetCCallable("torch", "fixme_new_string");
   }
   return fn(x, size);
 }
@@ -238,4 +238,4 @@ void* fixme_new_dimname(const char* x) {
   return fn(x);
 }
 
-#endif  // TORCH_IMPORTS
\ No newline at end of file
+#endif  // TORCH_IMPORTS