diff --git a/src/main.cpp b/src/main.cpp
index a2c46cb..6f36bc4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -296,48 +296,65 @@ int whisper_ctx_init_openvino_encoder_wrapper(struct whisper_context_wrapper * c
     return whisper_ctx_init_openvino_encoder(ctx->ptr, model_path, device, cache_dir);
 }
 
-class WhisperFullParamsWrapper : public whisper_full_params {
-    std::string initial_prompt_str;   
-    std::string suppress_regex_str;      
+struct WhisperFullParamsWrapper : public whisper_full_params {
+  std::string initial_prompt_str;
+  std::string suppress_regex_str;
 public:
-    py::function py_progress_callback;
-    WhisperFullParamsWrapper(const whisper_full_params& params = whisper_full_params())
-        : whisper_full_params(params),  
-        initial_prompt_str(params.initial_prompt ? params.initial_prompt : ""),
-        suppress_regex_str(params.suppress_regex ? params.suppress_regex : "") {
-        initial_prompt = initial_prompt_str.empty() ? nullptr : initial_prompt_str.c_str();
-        suppress_regex = suppress_regex_str.empty() ? nullptr : suppress_regex_str.c_str();
-        // progress callback
-        progress_callback_user_data = this;
-        progress_callback = [](struct whisper_context* ctx, struct whisper_state* state, int progress, void* user_data) {
-            auto* self = static_cast<WhisperFullParamsWrapper*>(user_data);
-            if(self && self->print_progress){
-                if (self->py_progress_callback) {
-                // call the python callback
-                    py::gil_scoped_acquire gil;
-                    self->py_progress_callback(progress);  // Call Python callback
-                }
-                else {
-                    fprintf(stderr, "Progress: %3d%%\n", progress);
-                } // Default message
-            }
-        } ;
-    }
-
-    WhisperFullParamsWrapper(const WhisperFullParamsWrapper& other)
-        : WhisperFullParamsWrapper(static_cast<const whisper_full_params&>(other)) {}
-
-    void set_initial_prompt(const std::string& prompt) {
-        initial_prompt_str = prompt;
-        initial_prompt = initial_prompt_str.c_str();
-    }
-
-    void set_suppress_regex(const std::string& regex) {
-        suppress_regex_str = regex;
-        suppress_regex = suppress_regex_str.c_str();
-    }
+  py::function py_progress_callback;
+  WhisperFullParamsWrapper(const whisper_full_params& params = whisper_full_params())
+    : whisper_full_params(params),
+      initial_prompt_str(params.initial_prompt ? params.initial_prompt : ""),
+      suppress_regex_str(params.suppress_regex ? params.suppress_regex : "") {
+    initial_prompt = initial_prompt_str.empty() ? nullptr : initial_prompt_str.c_str();
+    suppress_regex = suppress_regex_str.empty() ? nullptr : suppress_regex_str.c_str();
+    // progress callback
+    progress_callback_user_data = this;
+    progress_callback = [](struct whisper_context* ctx, struct whisper_state* state, int progress, void* user_data) {
+      auto* self = static_cast<WhisperFullParamsWrapper*>(user_data);
+      if(self && self->print_progress){
+        if (self->py_progress_callback) {
+          // call the python callback
+          py::gil_scoped_acquire gil;
+          self->py_progress_callback(progress);  // Call Python callback
+        }
+        else {
+          fprintf(stderr, "Progress: %3d%%\n", progress);
+        } // Default message
+      }
+    } ;
+  }
+  WhisperFullParamsWrapper(const WhisperFullParamsWrapper& other)
+    : whisper_full_params(static_cast<whisper_full_params>(other)),  // Copy base struct
+      initial_prompt_str(other.initial_prompt_str),
+      suppress_regex_str(other.suppress_regex_str),
+      py_progress_callback(other.py_progress_callback) {
+    // Reset pointers to new string copies
+    initial_prompt = initial_prompt_str.empty() ? nullptr : initial_prompt_str.c_str();
+    suppress_regex = suppress_regex_str.empty() ? nullptr : suppress_regex_str.c_str();
+    progress_callback_user_data = this;
+    progress_callback = [](struct whisper_context* ctx, struct whisper_state* state, int progress, void* user_data) {
+      auto* self = static_cast<WhisperFullParamsWrapper*>(user_data);
+      if(self && self->print_progress){
+        if (self->py_progress_callback) {
+          // call the python callback
+          py::gil_scoped_acquire gil;
+          self->py_progress_callback(progress);  // Call Python callback
+        }
+        else {
+          fprintf(stderr, "Progress: %3d%%\n", progress);
+        } // Default message
+      }
+    };
+  }
+  void set_initial_prompt(const std::string& prompt) {
+    initial_prompt_str = prompt;
+    initial_prompt = initial_prompt_str.c_str();
+  }
+  void set_suppress_regex(const std::string& regex) {
+    suppress_regex_str = regex;
+    suppress_regex = suppress_regex_str.c_str();
+  }
 };
-
 WhisperFullParamsWrapper  whisper_full_default_params_wrapper(enum whisper_sampling_strategy strategy) {
     return WhisperFullParamsWrapper(whisper_full_default_params(strategy));
 }