diff --git a/ApplicationCode/CMakeLists.txt b/ApplicationCode/CMakeLists.txt
index 898854dce0..7c10478b62 100644
--- a/ApplicationCode/CMakeLists.txt
+++ b/ApplicationCode/CMakeLists.txt
@@ -452,7 +452,7 @@ if (RESINSIGHT_PRIVATE_INSTALL)
         set(RESINSIGHT_INSTALL_RPATH ${RESINSIGHT_INSTALL_RPATH} ${RESINSIGHT_ODB_API_DIR}/lib)
       endif()
       
-      if (NOT(${RESINSIGHT_ERT_EXTERNAL_LIB_ROOT} STREQUAL ""))
+      if (EXISTS ${RESINSIGHT_ERT_EXTERNAL_LIB_ROOT}) 
         # append the external ERT lib root
         set(RESINSIGHT_INSTALL_RPATH ${RESINSIGHT_INSTALL_RPATH} ${RESINSIGHT_ERT_EXTERNAL_LIB_ROOT})
       endif()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e29037c5c..7e8fd24ce6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,8 +55,8 @@ include (ResInsightVersion.cmake)
 
 if (NOT MSVC)
   # Linux: Optional configuration of externally installed ERT, requires path to libraries and includes
-  set(RESINSIGHT_ERT_EXTERNAL_LIB_ROOT "" CACHE STRING "Path to installed ERT libraries")
-  set(RESINSIGHT_ERT_EXTERNAL_INCLUDE_ROOT "" CACHE STRING "Path to installed ERT includes")
+  set(RESINSIGHT_ERT_EXTERNAL_LIB_ROOT "" CACHE PATH "Path to installed ERT libraries")
+  set(RESINSIGHT_ERT_EXTERNAL_INCLUDE_ROOT "" CACHE PATH "Path to installed ERT includes")
 endif()
 
 if (RESINSIGHT_ERT_EXTERNAL_LIB_ROOT OR RESINSIGHT_ERT_EXTERNAL_INCLUDE_ROOT)