diff --git a/src/modules/systemlib/param/param.c b/src/modules/systemlib/param/param.c
index 19577ecf3c..53e08ad74d 100644
--- a/src/modules/systemlib/param/param.c
+++ b/src/modules/systemlib/param/param.c
@@ -1048,7 +1048,7 @@ param_export(int fd, bool only_unsaved)
 
 	param_lock_reader();
 
-	uint8_t bson_buffer[512];
+	uint8_t bson_buffer[256];
 	bson_encoder_init_buf(&encoder, &bson_buffer, sizeof(bson_buffer));
 
 	/* no modified parameters -> we are done */
diff --git a/src/modules/systemlib/param/param.h b/src/modules/systemlib/param/param.h
index 7a1cdf703f..4bcf1bceb4 100644
--- a/src/modules/systemlib/param/param.h
+++ b/src/modules/systemlib/param/param.h
@@ -299,6 +299,7 @@ __EXPORT void		param_reset_excludes(const char *excludes[], int num_excludes);
 
 /**
  * Export changed parameters to a file.
+ * Note: this method requires a large amount of stack size!
  *
  * @param fd		File descriptor to export to.
  * @param only_unsaved	Only export changed parameters that have not yet been exported.
@@ -365,6 +366,7 @@ __EXPORT const char	*param_get_default_file(void);
 
 /**
  * Save parameters to the default file.
+ * Note: this method requires a large amount of stack size!
  *
  * This function saves all parameters with non-default values.
  *