diff --git a/poincare/src/integer.cpp b/poincare/src/integer.cpp
index 1877f7ed6..5c1e072b5 100644
--- a/poincare/src/integer.cpp
+++ b/poincare/src/integer.cpp
@@ -602,6 +602,7 @@ IntegerDivision Integer::udiv(const Integer & numerator, const Integer & denomin
   half_native_uint_t b = denominator.halfDigit(denominator.numberOfHalfDigits()-1);
   half_native_uint_t halfBase = 1 << (16-1);
   int pow = 0;
+  assert(b != 0);
   while (!(b & halfBase)) {
     b = b << 1;
     pow++;