diff --git a/ds.h b/ds.h
index e7bec5c..7db0049 100644
--- a/ds.h
+++ b/ds.h
@@ -14,12 +14,12 @@ typedef struct _ds_dll {
 
 typedef struct {
   ds_sll_t **data;
-	unsigned   data_len;
+  unsigned   data_len;
 } ds_hmp_t;
 
 typedef struct {
-	char *key;
-	void *val;
+  char *key;
+  void *val;
 } _ds_hmp_kv_t;
 
 typedef struct {