diff --git a/Eigen/src/Core/Matrix.h b/Eigen/src/Core/Matrix.h
index ffd16d376..22090c777 100644
--- a/Eigen/src/Core/Matrix.h
+++ b/Eigen/src/Core/Matrix.h
@@ -505,7 +505,9 @@ class Matrix
     template<typename OtherDerived>
     EIGEN_STRONG_INLINE Matrix& _set(const MatrixBase<OtherDerived>& other)
     {
-      _set_selector(other.derived(), typename ei_meta_if<bool(int(OtherDerived::Flags) & EvalBeforeAssigningBit), ei_meta_true, ei_meta_false>::ret());
+      // this enum introduced to fix compilation with gcc 3.3
+      enum { cond = int(OtherDerived::Flags) & EvalBeforeAssigningBit };
+      _set_selector(other.derived(), typename ei_meta_if<bool(cond), ei_meta_true, ei_meta_false>::ret());
       return *this;
     }