diff --git a/binarytree.c b/binarytree.c
index 22818c5..548fc5a 100644
--- a/binarytree.c
+++ b/binarytree.c
@@ -138,7 +138,7 @@ void tree_free(Tree t) {
 }
 
 int main( int argc, char *argv[] ) {
-	int data[10] = {5,7,2,8,6,4,3,1,9,0};
+    int data[10] = {5,7,2,8,6,4,3,1,9,0};
     Tree t = tree_create();
     for(int i = 0; i < 10; i++) {
         tree_add(t,data[i]);
@@ -155,5 +155,5 @@ int main( int argc, char *argv[] ) {
         assert(tree_contains(t,data[i]));
     }
     tree_free(t);
-	return 0;
+    return 0;
 }