diff --git a/test/test_type_def.cpp b/test/test_type_def.cpp
index 36d7fb15b..13aa2b39e 100644
--- a/test/test_type_def.cpp
+++ b/test/test_type_def.cpp
@@ -371,7 +371,7 @@ namespace
       CHECK_EQUAL(i<<=2, uint32_t(t));
     }
 
-        //*************************************************************************
+    //*************************************************************************
     TEST(test_operator_right_shift_assignment_constexpr)
     {
       class __type_t__;
@@ -388,6 +388,23 @@ namespace
       CHECK_EQUAL(i>>=2, uint32_t(t));
     }
 
+    //*************************************************************************
+    TEST(test_operator_modulus_assignment_constexpr)
+    {
+      class __type_t__;
+      typedef etl::type_def<__type_t__, uint32_t> type_t;
+
+      constexpr auto modulus_assignment = []() {
+        type_t t(0x5A3DUL);
+        return t %= 2;
+      };
+
+      uint32_t i = 0x5A3DUL;
+      constexpr type_t t = modulus_assignment();
+
+      CHECK_EQUAL(i%=2, uint32_t(t));
+    }
+
     //*************************************************************************
     TEST(test_comparisons)
     {