diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h
index 4287fa249..e1d62fa17 100644
--- a/Eigen/src/Core/GenericPacketMath.h
+++ b/Eigen/src/Core/GenericPacketMath.h
@@ -638,7 +638,7 @@ struct pminmax_impl<PropagateNumbers, false> {
   }
 };
 
-#define EIGEN_BINARY_OP_NAN_PROPAGATION(Type, Func) [](const Type& a, const Type& b) { return Func(a, b); }
+#define EIGEN_BINARY_OP_NAN_PROPAGATION(Type, Func) [](const Type& aa, const Type& bb) { return Func(aa, bb); }
 
 /** \internal \returns the min of \a a and \a b  (coeff-wise).
     If \a a or \b b is NaN, the return value is implementation defined. */