diff --git a/cmake/Modules/OpmPackage.cmake b/cmake/Modules/OpmPackage.cmake
index d47e6b21146..a8a12e07e99 100644
--- a/cmake/Modules/OpmPackage.cmake
+++ b/cmake/Modules/OpmPackage.cmake
@@ -136,6 +136,9 @@ macro (find_opm_package module deps header lib defs prog conf)
     # since we don't have any config.h yet
     list (APPEND CMAKE_REQUIRED_DEFINITIONS ${${module}_DEFINITIONS})
     list (APPEND CMAKE_REQUIRED_DEFINITIONS ${${module}_CMD_CONFIG})
+    if(HAVE_${MODULE} STREQUAL "TRUE")
+      set(HAVE_${MODULE} "")
+    endif()
     check_cxx_source_compiles ("${prog}" HAVE_${MODULE})
     cmake_pop_check_state ()
   else()