diff --git a/tools/yulPhaser/Population.h b/tools/yulPhaser/Population.h
index 151474171..40d51498b 100644
--- a/tools/yulPhaser/Population.h
+++ b/tools/yulPhaser/Population.h
@@ -29,13 +29,6 @@
 namespace solidity::phaser
 {
 
-class Population;
-
-}
-
-namespace solidity::phaser
-{
-
 class PairSelection;
 class Selection;