diff --git a/src/simdb.h b/src/simdb.h
index 0c90827..0a45add 100644
--- a/src/simdb.h
+++ b/src/simdb.h
@@ -51,6 +51,14 @@ typedef struct _simdb_t simdb_t;
 #define REC_OFF_BM 16 /**< image bitmap */
 /** @} */
 
+/**
+ * database record
+ */
+typedef struct {
+  uint64_t num;                      /**< record number in database */
+  unsigned char data[SIMDB_REC_LEN]; /**< record raw data */
+} simdb_rec_t;
+
 /**
  * block of sequental records of database
  */
@@ -60,14 +68,6 @@ typedef struct {
   unsigned char *data; /**< raw records data */
 } simdb_block_t;
 
-/**
- * database record
- */
-typedef struct {
-  uint64_t num;                      /**< record number in database */
-  unsigned char data[SIMDB_REC_LEN]; /**< record raw data */
-} simdb_rec_t;
-
 /**
  * search parameters
  * maxdiff_* fields should have value from 0.0 to 1.0 (0% - 100%)