diff --git a/tests/unit/core/test-core-calc.cpp b/tests/unit/core/test-core-calc.cpp
index 3bf2a46fb..9adc431a0 100644
--- a/tests/unit/core/test-core-calc.cpp
+++ b/tests/unit/core/test-core-calc.cpp
@@ -344,6 +344,7 @@ TEST(CoreCalc, Expression)
     WEE_CHECK_CALC("0.0000000008", "1/1234567890");
     WEE_CHECK_CALC("0.0000000001", "1/12345678901");
     WEE_CHECK_CALC("0", "1/123456789012");
+    WEE_CHECK_CALC("1.2222222222", "1+0.22222222222222222222222222222222222");
 
     /* expressions with parentheses */
     WEE_CHECK_CALC("6", "((6))");