diff --git a/sorc/chgres_cube.fd/CMakeLists.txt b/sorc/chgres_cube.fd/CMakeLists.txt
index 877bf3a0f..5e7932e36 100644
--- a/sorc/chgres_cube.fd/CMakeLists.txt
+++ b/sorc/chgres_cube.fd/CMakeLists.txt
@@ -22,6 +22,11 @@ if(CMAKE_Fortran_COMPILER_ID MATCHES "^(Intel)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -r8 -convert big_endian -assume byterecl")
 elseif(CMAKE_Fortran_COMPILER_ID MATCHES "^(GNU)$")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-0 -fdefault-real-8 -fconvert=big-endian")
+  
+  # Turn on this argument mismatch flag for gfortran10.
+  if(CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 10)
+     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fallow-argument-mismatch")
+  endif()
 endif()
 
 set(exe_name chgres_cube)