diff --git a/poincare/src/expression.cpp b/poincare/src/expression.cpp
index 0d613cb9d..cb7b88c0a 100644
--- a/poincare/src/expression.cpp
+++ b/poincare/src/expression.cpp
@@ -295,10 +295,18 @@ int Expression::defaultGetPolynomialCoefficients(Context & context, const char *
 }
 
 int Expression::getPolynomialReducedCoefficients(const char * symbolName, Expression coefficients[], Context & context, Preferences::AngleUnit angleUnit) const {
+  // Reset recursion count if needed
+  bool willHaveToUnlock = ResetRecursionCountAndLockReset();
+
   int degree = getPolynomialCoefficients(context, symbolName, coefficients);
   for (int i = 0; i <= degree; i++) {
     coefficients[i] = coefficients[i].deepReduce(context, angleUnit);
   }
+
+  // Unlock recursion count reinitialization if needed
+  if (willHaveToUnlock) {
+    UnlockRecursionCountReset();
+  }
   return degree;
 }