diff --git a/CMakeLists.txt b/CMakeLists.txt
index cbb5021..25c8ae2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -500,11 +500,10 @@
   internal/ceres
   ${GLOG_INCLUDE_DIRS})
 # Eigen SparseQR generates various compiler warnings related to unused and
-# uninitialised local variables, which prevents Ceres compilation as we use
-# -Werror.  To avoid having to individually suppress these warnings around
-# the #include statments for Eigen headers across all GCC/Clang versions, we
-# tell CMake to treat Eigen headers as system headers.  This results in all
-# compiler warnings from them being suppressed.
+# uninitialised local variables.  To avoid having to individually suppress these
+# warnings around the #include statments for Eigen headers across all GCC/Clang
+# versions, we tell CMake to treat Eigen headers as system headers.  This
+# results in all compiler warnings from them being suppressed.
 #
 # Note that this is *not* propagated to clients, ie CERES_INCLUDE_DIRS
 # used by clients after find_package(Ceres) does not identify Eigen as
@@ -653,7 +652,7 @@
 if (UNIX)
   # GCC is not strict enough by default, so enable most of the warnings.
   set(CMAKE_CXX_FLAGS
-    "${CMAKE_CXX_FLAGS} -Werror=all -Werror=extra -Wno-unknown-pragmas -Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers")
+    "${CMAKE_CXX_FLAGS} -Wno-unknown-pragmas -Wno-sign-compare -Wno-unused-parameter -Wno-missing-field-initializers")
 endif (UNIX)
 
 # Use a larger inlining threshold for Clang, since it hobbles Eigen,