diff --git a/test/unit/datasource/geojson.cpp b/test/unit/datasource/geojson.cpp
index 2ed99d9e2..2b09f1443 100644
--- a/test/unit/datasource/geojson.cpp
+++ b/test/unit/datasource/geojson.cpp
@@ -824,7 +824,7 @@ TEST_CASE("geojson") {
                     std::initializer_list<attr> attrs = {
                         attr{"name", tr.transcode("Test")},
                         attr{"NOM_FR", tr.transcode("Québec")},
-                        attr{"boolean", mapnik::value_bool("true")},
+                        attr{"boolean", mapnik::value_bool(true)},
                         attr{"description", tr.transcode("Test: \u005C")},
                         attr{"double", mapnik::value_double(1.1)},
                         attr{"int", mapnik::value_integer(1)},
diff --git a/test/unit/datasource/topojson.cpp b/test/unit/datasource/topojson.cpp
index a7d793338..372cd187f 100644
--- a/test/unit/datasource/topojson.cpp
+++ b/test/unit/datasource/topojson.cpp
@@ -100,7 +100,7 @@ TEST_CASE("topojson")
             std::initializer_list<attr> attrs = {
                 attr{"name", tr.transcode("Test")},
                 attr{"NOM_FR", tr.transcode("Québec")},
-                attr{"boolean", mapnik::value_bool("true")},
+                attr{"boolean", mapnik::value_bool(true)},
                 attr{"description", tr.transcode("Test: \u005C")},
                 attr{"double", mapnik::value_double(1.1)},
                 attr{"int", mapnik::value_integer(1)},