diff --git a/Eigen/src/UmfPackSupport/UmfPackSupport.h b/Eigen/src/UmfPackSupport/UmfPackSupport.h
index fa62636e9..ca2f73dbe 100644
--- a/Eigen/src/UmfPackSupport/UmfPackSupport.h
+++ b/Eigen/src/UmfPackSupport/UmfPackSupport.h
@@ -12,8 +12,6 @@
 
 namespace Eigen {
 
-#define UF_long __int64
-
 /* TODO extract L, extract U, compute det, etc... */
 
 // generic double/complex<double> wrapper functions: