diff --git a/poincare/test/simplify.cpp b/poincare/test/simplify.cpp
index 480e5e896..952ffd5a6 100644
--- a/poincare/test/simplify.cpp
+++ b/poincare/test/simplify.cpp
@@ -4,12 +4,12 @@
 
 QUIZ_CASE(poincare_simplify) {
   {
-    Expression * e = Expression::parse((char *)"3*0");
+    Expression * e = Expression::parse("3*0");
     Expression * e2 = e->simplify();
     assert(e2->type() == Expression::Type::Integer);
   }
   {
-    Expression * e = Expression::parse((char *)"0*foo");
+    Expression * e = Expression::parse("0*foo");
     Expression * e2 = e->simplify();
     assert(e2->type() == Expression::Type::Integer);
   }