diff --git a/mapping_test.go b/mapping_test.go
index 467b57be..f4df3c8a 100644
--- a/mapping_test.go
+++ b/mapping_test.go
@@ -470,7 +470,7 @@ func TestInvalidDocumentMappingStrict(t *testing.T) {
 	}
 
 	if dm.Enabled != false {
-		t.Fatalf("expect to find document mapping enabled false, got '%s'", dm.Enabled)
+		t.Fatalf("expect to find document mapping enabled false, got '%t'", dm.Enabled)
 	}
 
 	// reset
@@ -490,7 +490,7 @@ func TestInvalidDocumentMappingStrict(t *testing.T) {
 	}
 
 	if dm.Enabled != false {
-		t.Fatalf("expect to find document mapping enabled false, got '%s'", dm.Enabled)
+		t.Fatalf("expect to find document mapping enabled false, got '%t'", dm.Enabled)
 	}
 }