diff --git a/src/dna_seq_indexer.c b/src/dna_seq_indexer.c
index 26e4566..b885042 100644
--- a/src/dna_seq_indexer.c
+++ b/src/dna_seq_indexer.c
@@ -16,7 +16,8 @@
 
 #include "obiblob.h"
 #include "obiblob_indexer.h"
-#include "obidms.h"
+#include "obidebug.h"
+#include "obitypes.h"
 
 
 #define DEBUG_LEVEL 0	// TODO has to be defined somewhere else (cython compil flag?)
@@ -91,16 +92,11 @@ index_t obi_index_dna_seq(Obi_indexer_p indexer, const char* value)
 char* obi_retrieve_dna_seq(Obi_indexer_p indexer, index_t idx)
 {
 	Obi_blob_p  value_b;
-	char*		seq;
 
 	// Get encoded value
 	value_b = obi_indexer_get(indexer, idx);
 
-	// Decode sequence
-	seq = obi_blob_to_seq(value_b);
-
-	free(value_b);
-
-	return seq;
+	// Return decoded sequence
+	return obi_blob_to_seq(value_b);
 }
 
diff --git a/src/obidmscolumn_seq.c b/src/obidmscolumn_seq.c
index 66caddc..fe099b9 100644
--- a/src/obidmscolumn_seq.c
+++ b/src/obidmscolumn_seq.c
@@ -33,7 +33,7 @@
 
 int obi_column_set_obiseq_with_elt_idx(OBIDMS_column_p column, index_t line_nb, index_t element_idx, char* value)
 {
-	index_t    idx;
+	index_t idx;
 
 	// Check that the line number is not greater than the maximum allowed
 	if (line_nb >= MAXIMUM_LINE_COUNT)
@@ -96,10 +96,7 @@ int obi_column_set_obiseq_with_elt_idx_in_view(Obiview_p view, OBIDMS_column_p c
 			return -1;
 	}
 
-	if (obi_column_set_obiseq_with_elt_idx(column, line_nb, element_idx, value) < 0)
-		return -1;
-
-	return 0;
+	return obi_column_set_obiseq_with_elt_idx(column, line_nb, element_idx, value);
 }
 
 
@@ -146,8 +143,7 @@ int obi_column_set_obiseq_with_elt_name(OBIDMS_column_p column, index_t line_nb,
 	element_idx = obi_column_get_element_index_from_name(column, element_name);
 	if (element_idx == OBIIdx_NA)
 		return -1;
-	obi_column_set_obiseq_with_elt_idx(column, line_nb, element_idx, value);
-	return 0;
+	return obi_column_set_obiseq_with_elt_idx(column, line_nb, element_idx, value);
 }
 
 
@@ -157,8 +153,7 @@ int obi_column_set_obiseq_with_elt_name_in_view(Obiview_p view, OBIDMS_column_p
 	element_idx = obi_column_get_element_index_from_name(column, element_name);
 	if (element_idx == OBIIdx_NA)
 		return -1;
-	obi_column_set_obiseq_with_elt_idx_in_view(view, column, line_nb, element_idx, value);
-	return 0;
+	return obi_column_set_obiseq_with_elt_idx_in_view(view, column, line_nb, element_idx, value);
 }