diff --git a/CMakeLists.txt b/CMakeLists.txt
index 971666e9e8..716a3f2d12 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,8 +53,10 @@ include (ResInsightVersion.cmake)
 
 # Disable install of ERT libs and headers, as Ert code is compiled and linked directly
 SET(INSTALL_ERT OFF CACHE BOOL "ERT: Install library")
+SET(BUILD_SHARED_LIBS OFF CACHE BOOL "ERT: Build shared libraries")
 SET(ERT_USE_OPENMP ${OPENMP_FOUND} CACHE BOOL "ERT: Compile using OpenMP")
 
+
 add_subdirectory(ThirdParty/Ert/devel)
 
 include_directories(