diff --git a/poincare/src/binomial_coefficient.cpp b/poincare/src/binomial_coefficient.cpp
index b1d947a48..dfabebd51 100644
--- a/poincare/src/binomial_coefficient.cpp
+++ b/poincare/src/binomial_coefficient.cpp
@@ -100,7 +100,7 @@ Expression * BinomialCoefficient::templatedApproximate(Context& context, AngleUn
   T result = 1;
   for (int i = 0; i < k; i++) {
     result *= (n-(T)i)/(k-(T)i);
-    if (std::isinf(result)) {
+    if (std::isinf(result) || std::isnan(result)) {
       return new Complex<T>(Complex<T>::Float(result));
     }
   }
diff --git a/poincare/src/permute_coefficient.cpp b/poincare/src/permute_coefficient.cpp
index 4ecc692ef..fd4536e97 100644
--- a/poincare/src/permute_coefficient.cpp
+++ b/poincare/src/permute_coefficient.cpp
@@ -87,7 +87,7 @@ Complex<T> * PermuteCoefficient::templatedApproximate(Context& context, AngleUni
   T result = 1;
   for (int i = (int)n-(int)k+1; i <= (int)n; i++) {
     result *= i;
-    if (std::isinf(result)) {
+    if (std::isinf(result) || std::isnan(result)) {
       return new Complex<T>(Complex<T>::Float(result));
     }
   }