diff --git a/apps/calculation/calculation.cpp b/apps/calculation/calculation.cpp
index c37502501..36365d3d5 100644
--- a/apps/calculation/calculation.cpp
+++ b/apps/calculation/calculation.cpp
@@ -3,6 +3,7 @@
 #include "../shared/poincare_helpers.h"
 #include <poincare/symbol.h>
 #include <poincare/undefined.h>
+#include <poincare/unreal.h>
 #include <string.h>
 #include <cmath>
 
@@ -53,13 +54,6 @@ void Calculation::setContent(const char * c, Context * context, Expression ansEx
   PoincareHelpers::ParseAndSimplifyAndApproximate(m_inputText, &exactOutput, &approximateOutput, *context);
   PoincareHelpers::Serialize(exactOutput, m_exactOutputText, sizeof(m_exactOutputText));
   PoincareHelpers::Serialize(approximateOutput, m_approximateOutputText, sizeof(m_approximateOutputText));
-  /* Check ComplexFormat: if complex format is real and the input text doesn't
-   * contain any i complex, both approximate and exact result are set to
-   * Undefined if the approximate output is not a pure real.*/
-  if (Preferences::sharedPreferences()->complexFormat() == Preferences::ComplexFormat::Real && strchr(m_inputText, Ion::Charset::IComplex) == nullptr && strchr(m_approximateOutputText, Ion::Charset::IComplex) != nullptr) {
-    strlcpy(m_exactOutputText, Undefined::Name(), Constant::MaxSerializedExpressionSize);
-    strlcpy(m_approximateOutputText, Undefined::Name(), Constant::MaxSerializedExpressionSize);
-  }
 }
 
 KDCoordinate Calculation::height(Context * context) {
@@ -161,7 +155,8 @@ bool Calculation::shouldOnlyDisplayApproximateOutput(Context * context) {
      * significant digits, the two layouts are not equal, we display both. */
     return exactAndApproximateDisplayedOutputsAreEqual(context) == Calculation::EqualSign::Equal;
   }
-  if (strcmp(m_exactOutputText, Undefined::Name()) == 0) {
+  if (strcmp(m_exactOutputText, Undefined::Name()) == 0 || strcmp(m_approximateOutputText, Unreal::Name()) == 0 ) {
+    /* if the approximate result is 'unreal' or the exact result is 'undef'*/
     return true;
   }
   return input().isApproximate(*context) || exactOutput().isApproximate(*context);
diff --git a/apps/calculation/test/calculation_store.cpp b/apps/calculation/test/calculation_store.cpp
index f7679cc31..77672b631 100644
--- a/apps/calculation/test/calculation_store.cpp
+++ b/apps/calculation/test/calculation_store.cpp
@@ -120,17 +120,21 @@ QUIZ_CASE(calculation_complex_format) {
 
   Poincare::Preferences::sharedPreferences()->setComplexFormat(Poincare::Preferences::ComplexFormat::Real);
   assertCalculationDisplay("1+I", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "1+I", &globalContext, &store);
-  assertCalculationDisplay("R(-1)", true, false, ::Calculation::Calculation::EqualSign::Unknown, "undef", nullptr, &globalContext, &store);
-  assertCalculationDisplay("ln(-2)", true, false, ::Calculation::Calculation::EqualSign::Unknown, "undef", nullptr, &globalContext, &store);
+  assertCalculationDisplay("R(-1)", false, true, ::Calculation::Calculation::EqualSign::Unknown, "unreal", nullptr, &globalContext, &store);
+  assertCalculationDisplay("ln(-2)", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "unreal", &globalContext, &store);
+  assertCalculationDisplay("R(-1)*R(-1)", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "unreal", &globalContext, &store);
 
   Poincare::Preferences::sharedPreferences()->setComplexFormat(Poincare::Preferences::ComplexFormat::Cartesian);
   assertCalculationDisplay("1+I", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "1+I", &globalContext, &store);
   assertCalculationDisplay("R(-1)", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "I", &globalContext, &store);
   assertCalculationDisplay("ln(-2)", false, false, ::Calculation::Calculation::EqualSign::Approximation, "ln(-2)", nullptr, &globalContext, &store);
+  assertCalculationDisplay("R(-1)*R(-1)", false, true, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "-1", &globalContext, &store);
 
   Poincare::Preferences::sharedPreferences()->setComplexFormat(Poincare::Preferences::ComplexFormat::Polar);
   assertCalculationDisplay("1+I", false, false, ::Calculation::Calculation::EqualSign::Approximation, "R(2)*X^(P/4*I)", nullptr, &globalContext, &store);
   assertCalculationDisplay("R(-1)", false, false, ::Calculation::Calculation::EqualSign::Approximation, "X^(P/2*I)", nullptr, &globalContext, &store);
   assertCalculationDisplay("ln(-2)", false, false, ::Calculation::Calculation::EqualSign::Approximation, "ln(-2)", nullptr, &globalContext, &store);
+  assertCalculationDisplay("R(-1)*R(-1)", false, false, ::Calculation::Calculation::EqualSign::Unknown, nullptr, "X^(3.1415926535898*I)", &globalContext, &store);
+
   Poincare::Preferences::sharedPreferences()->setComplexFormat(Poincare::Preferences::ComplexFormat::Cartesian);
 }