diff --git a/libheif/api/libheif/heif.cc b/libheif/api/libheif/heif.cc
index 5a10ab64c7..9192f5087e 100644
--- a/libheif/api/libheif/heif.cc
+++ b/libheif/api/libheif/heif.cc
@@ -3055,7 +3055,7 @@ heif_encoder_parameter_get_valid_integer_range(const struct heif_encoder_paramet
   return heif_error_success;
 }
 
-LIBHEIF_API
+
 struct heif_error heif_encoder_parameter_get_valid_integer_values(const struct heif_encoder_parameter* param,
                                                                   int* have_minimum, int* have_maximum,
                                                                   int* minimum, int* maximum,
diff --git a/libheif/api/libheif/heif_items.cc b/libheif/api/libheif/heif_items.cc
index 90cae4887d..6b8fdd9ec1 100644
--- a/libheif/api/libheif/heif_items.cc
+++ b/libheif/api/libheif/heif_items.cc
@@ -256,7 +256,7 @@ struct heif_error heif_context_add_mime_item(struct heif_context* ctx,
   }
 }
 
-LIBHEIF_API
+
 struct heif_error heif_context_add_precompressed_mime_item(struct heif_context* ctx,
                                                            const char* content_type,
                                                            const char* content_encoding,
diff --git a/libheif/api/libheif/heif_properties.cc b/libheif/api/libheif/heif_properties.cc
index 5040f81b00..4b43a02bd3 100644
--- a/libheif/api/libheif/heif_properties.cc
+++ b/libheif/api/libheif/heif_properties.cc
@@ -182,7 +182,6 @@ struct heif_error heif_item_get_property_user_description(const struct heif_cont
 }
 
 
-LIBHEIF_API
 struct heif_error heif_item_add_property_user_description(const struct heif_context* context,
                                                           heif_item_id itemId,
                                                           const struct heif_property_user_description* description,