diff --git a/apps/probability/law/chi_squared_law.cpp b/apps/probability/law/chi_squared_law.cpp
index c212fa77d..86d3bfd04 100644
--- a/apps/probability/law/chi_squared_law.cpp
+++ b/apps/probability/law/chi_squared_law.cpp
@@ -50,7 +50,7 @@ double ChiSquaredLaw::cumulativeDistributiveFunctionAtAbscissa(double x) const {
 }
 
 double ChiSquaredLaw::cumulativeDistributiveInverseForProbability(double * probability) {
-  return cumulativeDistributiveInverseForProbabilityUsingBrentRoots(proba);
+  return cumulativeDistributiveInverseForProbabilityUsingBrentRoots(probability);
 }
 
 float ChiSquaredLaw::coefficient() const {
diff --git a/apps/probability/law/student_law.cpp b/apps/probability/law/student_law.cpp
index 61b2390c6..3bbb14f14 100644
--- a/apps/probability/law/student_law.cpp
+++ b/apps/probability/law/student_law.cpp
@@ -31,7 +31,7 @@ double StudentLaw::cumulativeDistributiveFunctionAtAbscissa(double x) const {
 }
 
 double StudentLaw::cumulativeDistributiveInverseForProbability(double * probability) {
-  return cumulativeDistributiveInverseForProbabilityUsingBrentRoots(proba);
+  return cumulativeDistributiveInverseForProbabilityUsingBrentRoots(probability);
 }
 
 float StudentLaw::coefficient() const {