diff --git a/i18n/en.json b/i18n/en.json
index c103282..76b29dd 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -29,7 +29,7 @@
 	"math-test-start": "Running backend tests for rendering mode ''$1''.",
 	"math-test-success": "Test ''$1'' <span style=\"color:green\">succeeded</span>.",
 	"math-test-contains-diff" : "Returned string $1 does not contain expected string $2.",
-	"math-test-equals-diff" : "Returned string $1 is different from expected string $2",
+	"math-test-equals-diff" : "Returned string $1 is different from expected string $2.",
 	"math_tip": "Mathematical formula (LaTeX)",
 	"math_unknown_error": "unknown error",
 	"math_unknown_function": "unknown function \"$1\"",