diff --git a/poincare/src/power.cpp b/poincare/src/power.cpp
index cfd0076c0..9d7de229d 100644
--- a/poincare/src/power.cpp
+++ b/poincare/src/power.cpp
@@ -553,7 +553,9 @@ Expression Power::shallowReduce(Context & context, Preferences::AngleUnit angleU
     }
   }
   // (a)^(1/2) with a < 0 --> i*(-a)^(1/2)
+  // WARNING: this rule true only if a real (ex: (-1*i)^(1/2) != i*i^(1/2)
   if (!letPowerAtRoot
+      && childAtIndex(0).isReal(context, angleUnit)
       && childAtIndex(1).type() == ExpressionNode::Type::Rational
       && childAtIndex(1).convert<Rational>().isHalf())
   {
diff --git a/poincare/test/power.cpp b/poincare/test/power.cpp
index 50fc3871b..027d828a6 100644
--- a/poincare/test/power.cpp
+++ b/poincare/test/power.cpp
@@ -52,6 +52,7 @@ QUIZ_CASE(poincare_power_simplify) {
   assert_parsed_expression_simplify_to("(12^4*x)^(0.5)", "144*R(x)");
   assert_parsed_expression_simplify_to("R(32)", "4*R(2)");
   assert_parsed_expression_simplify_to("R(-1)", "I");
+  assert_parsed_expression_simplify_to("R(-1*R(-1))", "R(2)/2-R(2)/2*I");
   assert_parsed_expression_simplify_to("R(3^2)", "3");
   assert_parsed_expression_simplify_to("2^(2+P)", "4*2^P");
   assert_parsed_expression_simplify_to("R(5513219850886344455940081)", "2348024669991");