diff --git a/src/inc/textbuffer.h b/src/inc/textbuffer.h
index 4f52c19cfa43761a6c460df831ffd20f89470c4e..b46b98ed382e207d77abdff8a8bd2f41408f5fd5 100644
--- a/src/inc/textbuffer.h
+++ b/src/inc/textbuffer.h
@@ -28,9 +28,6 @@ extern "C" {
 #define MAX_TMPFILE_PATH_LENGTH PATH_MAX
 #define INITIAL_ALLOCATION_BUFFER_SIZE 64
 
-// forward declaration
-struct tTagSchema;
-
 typedef enum EXT_BUFFER_FLUSH_MODEL {
   /*
    * all data that have been flushed to disk is belonged to the same group