diff --git a/src/Mod/Sketcher/App/CMakeLists.txt b/src/Mod/Sketcher/App/CMakeLists.txt
index c4458ddc4..50f02edfd 100644
--- a/src/Mod/Sketcher/App/CMakeLists.txt
+++ b/src/Mod/Sketcher/App/CMakeLists.txt
@@ -10,7 +10,7 @@ if (OPENMP_FOUND)
     set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
 endif()
 
-
+set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DEIGEN_NO_DEBUG") # Necessary to avoid SparseQR crash with Eigen 3.2 due to a wrong assertion
 
 include_directories(
     ${CMAKE_BINARY_DIR}
diff --git a/src/Mod/Sketcher/App/planegcs/GCS.cpp b/src/Mod/Sketcher/App/planegcs/GCS.cpp
index dc4533493..0183177cb 100644
--- a/src/Mod/Sketcher/App/planegcs/GCS.cpp
+++ b/src/Mod/Sketcher/App/planegcs/GCS.cpp
@@ -27,6 +27,10 @@
 #include "GCS.h"
 #include "qp_eq.h"
 
+// NOTE: In CMakeList.txt -DEIGEN_NO_DEBUG is set (it does not work with a define here), to solve this:
+// this is needed to fix this SparseQR crash http://forum.freecadweb.org/viewtopic.php?f=10&t=11341&p=92146#p92146, 
+// until Eigen library fixes its own problem with the assertion (definitely not solved in 3.2.0 branch)
+
 #include <Eigen/QR>
 #include <Eigen/Sparse>
 #include <Eigen/OrderingMethods>