diff --git a/modules/core/src/math/kalman/vpUKSigmaDrawerMerwe.cpp b/modules/core/src/math/kalman/vpUKSigmaDrawerMerwe.cpp
index 3f1780fbc6..56d64fb2dd 100644
--- a/modules/core/src/math/kalman/vpUKSigmaDrawerMerwe.cpp
+++ b/modules/core/src/math/kalman/vpUKSigmaDrawerMerwe.cpp
@@ -85,7 +85,7 @@ vpUKSigmaDrawerMerwe::vpSigmaPointsWeights vpUKSigmaDrawerMerwe::computeWeights(
   return weights;
 }
 #else
-vpUKSigmaDrawerMerwe_dummy()
+void vpUKSigmaDrawerMerwe_dummy()
 {
 
 }