diff --git a/vm/free_list.hpp b/vm/free_list.hpp
index ad880b92d0..2f03b531fd 100644
--- a/vm/free_list.hpp
+++ b/vm/free_list.hpp
@@ -9,7 +9,7 @@ struct free_heap_block
 
 	bool free_p() const
 	{
-		return header & 1 == 1;
+		return (header & 1) == 1;
 	}
 
 	cell size() const
diff --git a/vm/layouts.hpp b/vm/layouts.hpp
index ff7ccbf3c0..831cc387d2 100644
--- a/vm/layouts.hpp
+++ b/vm/layouts.hpp
@@ -147,7 +147,7 @@ struct object {
 	to do anything with it if its free */
 	bool free_p() const
 	{
-		return h.value & 1 == 1;
+		return (h.value & 1) == 1;
 	}
 };
 
@@ -221,7 +221,7 @@ struct code_block
 
 	bool free_p() const
 	{
-		return header & 1 == 1;
+		return (header & 1) == 1;
 	}
 
 	code_block_type type() const