diff --git a/main.c b/main.c
index ecec03d..9bd0071 100644
--- a/main.c
+++ b/main.c
@@ -581,7 +581,7 @@ void boolset_discard(struct boolset* this, uint16_t e)
     
     assert(this->data[0][e]);
 
-    for (int k = 0; k < B && !--this->	data[k][e >> k]; k++);
+    for (int k = 0; k < B && !--this->data[k][e >> k]; k++);
     
     #if ZDEBUG
     calldepth--;