diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 008b8b2f..40bb9a1a 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -3,4 +3,5 @@ if(WIN32)
 else()
     set(FCOMPARE_EXE ${CMAKE_BINARY_DIR}/Submodules/AMReX/Tools/Plotfile/amrex_fcompare CACHE INTERNAL "Path to fcompare executable for regression tests")
 endif()
+set(FCOMPARE_TOLERANCE "-r 1e-11 --abs_tol 1.0e-11")
 include(${CMAKE_CURRENT_SOURCE_DIR}/CTestList.cmake)