diff --git a/test/src/unit-diagnostics.cpp b/test/src/unit-diagnostics.cpp
index 1cea374a7..21ced33b1 100644
--- a/test/src/unit-diagnostics.cpp
+++ b/test/src/unit-diagnostics.cpp
@@ -93,7 +93,8 @@ TEST_CASE("Better diagnostics")
 
     SECTION("Parse error")
     {
-        CHECK_THROWS_WITH_AS(json::parse(""), "[json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal", json::parse_error);
+        json _;
+        CHECK_THROWS_WITH_AS(_ = json::parse(""), "[json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal", json::parse_error);
     }
 
     SECTION("Regression test for https://github.com/nlohmann/json/pull/2562#pullrequestreview-574858448")