diff --git a/src/libecoPCR/ecoseq.c b/src/libecoPCR/ecoseq.c
index 2b5b56a..cc25ad5 100644
--- a/src/libecoPCR/ecoseq.c
+++ b/src/libecoPCR/ecoseq.c
@@ -152,6 +152,9 @@ FILE *open_seqfile(const char *prefix,int32_t index)
 	                           "%s_%03d.sdx",
 	                           prefix,
 	                           index);
+	                           
+			fprintf(stderr,"Coucou %s\n",filename_buffer);
+	                           
 
 	if (filename_length >= 1024)
 		ECOERROR(ECO_ASSERT_ERROR,"file name is too long");
@@ -172,6 +175,7 @@ ecoseq_t *ecoseq_iterator(const char *prefix)
 {
 	static FILE    *current_seq_file= NULL;
 	static int32_t current_file_idx = 1;
+	static char    current_prefix[1024];
 	ecoseq_t       *seq;
 	
 	if (prefix)
@@ -180,8 +184,11 @@ ecoseq_t *ecoseq_iterator(const char *prefix)
 
 		if (current_seq_file)
 			fclose(current_seq_file);
+			
+		strncpy(current_prefix,prefix,1023);
+		current_prefix[1024]=0;
 		
-		current_seq_file = open_seqfile(prefix,
+		current_seq_file = open_seqfile(current_prefix,
 		 							    current_file_idx);
 		
 		if (!current_seq_file)
@@ -195,8 +202,10 @@ ecoseq_t *ecoseq_iterator(const char *prefix)
 	{
 		current_file_idx++;
 		fclose(current_seq_file);
-		current_seq_file = open_seqfile(prefix,
+		current_seq_file = open_seqfile(current_prefix,
 		 							    current_file_idx);
+		 							    
+		
 		if (current_seq_file)
 			seq = readnext_ecoseq(current_seq_file);
 	}