diff --git a/test/sort.cpp b/test/sort.cpp
index 3be218128..82b32e327 100644
--- a/test/sort.cpp
+++ b/test/sort.cpp
@@ -243,11 +243,11 @@ auto main() -> int {  // NOLINT(readability-function-cognitive-complexity,bugpro
 		BOOST_TEST(!(name1 < name2));
 
 		BOOST_TEST( name2[1][0] == 'a' );
-		BOOST_TEST( name2[1][1] = 'a' );
-		BOOST_TEST( name2[2][0] = 'b' );
-		BOOST_TEST( name2[2][1] = 'a' );
-		BOOST_TEST( name2[3][0] = 'c' );
-		BOOST_TEST( name2[3][1] = 'a' );
+		BOOST_TEST( name2[1][1] == 'a' );
+		BOOST_TEST( name2[2][0] == 'b' );
+		BOOST_TEST( name2[2][1] == 'a' );
+		BOOST_TEST( name2[3][0] == 'c' );
+		BOOST_TEST( name2[3][1] == 'a' );
 	}
 
 	BOOST_AUTO_TEST_CASE(accumulate_1d) {