diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index e3ebb029..b6366d5e 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -135,7 +135,7 @@ if (NOT EIGEN2_INCLUDE_DIR)
   if (NOT $ENV{OPENSCAD_LIBRARIES} STREQUAL "")
     set(EIGEN2_FIND_HINTS "$ENV{OPENSCAD_LIBRARIES}/include/eigen2")
   endif()
-  set(EIGEN2_FIND_HINTS ${EIGEN2_HINTS} $ENV{EIGEN2DIR})
+  set(EIGEN2_FIND_HINTS ${EIGEN2_FIND_HINTS} $ENV{EIGEN2DIR})
   if (${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
     set(EIGEN2_FIND_PATHS /usr/local/include/eigen2)
   else()