diff --git a/poincare/test/helper.h b/poincare/test/helper.h
index 81c42aaac..ed54c3c2a 100644
--- a/poincare/test/helper.h
+++ b/poincare/test/helper.h
@@ -5,6 +5,8 @@
 static const char * MaxIntegerString = "179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137215"; // (2^32)^k_maxNumberOfDigits-1
 static const char * OverflowedIntegerString = "179769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216"; // (2^32)^k_maxNumberOfDigits
 
+static const char * BigOverflowedIntegerString = "279769313486231590772930519078902473361797697894230657273430081157732675805500963132708477322407536021120113879871393357658789768814416622492847430639474124377767893424865485276302219601246094119453082952085005768838150682342462881473913110540827237163350510684586298239947245938479716304835356329624224137216"; // OverflowedIntegerString with a 2 on first digit
+
 constexpr Poincare::Preferences::AngleUnit Degree = Poincare::Preferences::AngleUnit::Degree;
 constexpr Poincare::Preferences::AngleUnit Radian = Poincare::Preferences::AngleUnit::Radian;
 constexpr Poincare::Preferences::ComplexFormat Cartesian = Poincare::Preferences::ComplexFormat::Cartesian;
diff --git a/poincare/test/rational.cpp b/poincare/test/rational.cpp
index 9ba838e2e..1a7d9c9ec 100644
--- a/poincare/test/rational.cpp
+++ b/poincare/test/rational.cpp
@@ -82,23 +82,23 @@ QUIZ_CASE(poincare_rational_power) {
 
 QUIZ_CASE(poincare_rational_simplify) {
   // 1/MaxIntegerString
-  /*char buffer[400] = "1/";
+  char buffer[400] = "1/";
   strlcpy(buffer+2, MaxIntegerString, 400-2);
   assert_parsed_expression_simplify_to(buffer, buffer);
   // 1/OverflowedIntegerString
-  strlcpy(buffer+2, OverflowedIntegerString, 400-2);
-  assert_parsed_expression_simplify_to(buffer, "0");
+  strlcpy(buffer+2, BigOverflowedIntegerString, 400-2);
+  assert_parsed_expression_simplify_to(buffer, "1/inf");
   // MaxIntegerString
   assert_parsed_expression_simplify_to(MaxIntegerString, MaxIntegerString);
   // OverflowedIntegerString
-  assert_parsed_expression_simplify_to(OverflowedIntegerString, "inf");
-  assert_parsed_expression_simplify_to(OverflowedIntegerString, "inf");
+  assert_parsed_expression_simplify_to(BigOverflowedIntegerString, "inf");
+  assert_parsed_expression_simplify_to(BigOverflowedIntegerString, "inf");
   // -OverflowedIntegerString
   buffer[0] = '-';
-  strlcpy(buffer+1, OverflowedIntegerString, 400-1);
-  assert_parsed_expression_simplify_to(buffer, "-inf");*/
+  strlcpy(buffer+1, BigOverflowedIntegerString, 400-1);
+  assert_parsed_expression_simplify_to(buffer, "-inf");
 
-  /*assert_parsed_expression_simplify_to("-1/3", "-1/3");
+  assert_parsed_expression_simplify_to("-1/3", "-1/3");
   assert_parsed_expression_simplify_to("22355/45325", "4471/9065");
   assert_parsed_expression_simplify_to("0000.000000", "0");
   assert_parsed_expression_simplify_to(".000000", "0");
@@ -122,7 +122,7 @@ QUIZ_CASE(poincare_rational_simplify) {
   assert_parsed_expression_simplify_to("x^0", "1");
   assert_parsed_expression_simplify_to("P^0", "1");
   assert_parsed_expression_simplify_to("A^0", "1");
-  assert_parsed_expression_simplify_to("(-3)^0", "1");*/
+  assert_parsed_expression_simplify_to("(-3)^0", "1");
 }
 
 QUIZ_CASE(poincare_rational_approximate) {