diff --git a/src/main/java/dk/sdu/compbio/faithmcs/network/io/SIFImporter.java b/src/main/java/dk/sdu/compbio/faithmcs/network/io/SIFImporter.java
index 668e5df..4b2c530 100644
--- a/src/main/java/dk/sdu/compbio/faithmcs/network/io/SIFImporter.java
+++ b/src/main/java/dk/sdu/compbio/faithmcs/network/io/SIFImporter.java
@@ -24,7 +24,7 @@ public void read(Graph<Node,Edge> network, File file) throws FileNotFoundExcepti
 
             if(first_line) {
                 first_line = false;
-                if(line.contains("\t")) delimiter = " ";
+                if(line.contains("\t")) delimiter = "\t";
             }
 
             String[] parts = line.split(delimiter);