diff --git a/partitioning/fast_clustering.cpp b/partitioning/fast_clustering.cpp
index cf21f0cef4d30a9606137db98324b0c6d839534f..dc7c23052e09f10d0ec541171240dd5143a40643 100755
--- a/partitioning/fast_clustering.cpp
+++ b/partitioning/fast_clustering.cpp
@@ -167,7 +167,7 @@ int main(int argc, char* argv[]) {
     input_fastq = "new_tests/"+data_name+"/shuffled_reads_"+data_name+".fastq";
     output_dir = "new_tests/"+data_name+"/clusters_"+data_name;
 
-    std::string start_primer = "AGCCATCGTACGTAGCGGAT";
+    std::string start_primer = "GTTCAGAGTTCTACAGTCCGACGATCC";
 
     clustering(input_fastq, start_primer, 3, output_dir);