diff --git a/internal/tshelpers/custom_commands.go b/internal/tshelpers/custom_commands.go
index 738cf1157d..be0bd7f40c 100644
--- a/internal/tshelpers/custom_commands.go
+++ b/internal/tshelpers/custom_commands.go
@@ -431,7 +431,7 @@ func byteCompareInternal(ts *testscript.TestScript, neg bool, aData, eData []byt
 		return
 	}
 
-	ts.Logf(aText)
+	ts.Logf("%s", aText)
 
 	var sb strings.Builder
 	if err := diff.Text(eFilePath, aFilePath, eText, aText, &sb); err != nil {