diff --git a/cime_config/machines/Depends.gnu.cmake b/cime_config/machines/Depends.gnu.cmake
index 72ee0e834511..f690c9f88526 100644
--- a/cime_config/machines/Depends.gnu.cmake
+++ b/cime_config/machines/Depends.gnu.cmake
@@ -13,19 +13,11 @@ if (NOT DEBUG)
   endif()
 endif()
 
-list(APPEND ALLOW_INVALID_BOZ_LIST
-  eam/src/control/cam_history.F90
-  elm/src/biogeochem/MEGANFactorsMod.F90
-)
 list(APPEND NO_INLINE_ARG_PACKING_LIST
   eam/src/dynamics/se/inidat.F90
 )
 
 if (CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 10)
-  foreach(ITEM IN LISTS ALLOW_INVALID_BOZ_LIST)
-    e3sm_add_flags("${ITEM}" "-fallow-invalid-boz") # avoids build error for integer, parameter :: gen_hash_key_offset = z'000053db'
-  endforeach()
-
   if (NOT DEBUG)
     # new in gnu10, inline arg packing was causing INF values with SMS_P4x1.ne4pg2_ne4pg2.F-MMFXX
     foreach(ITEM IN LISTS NO_INLINE_ARG_PACKING_LIST)
diff --git a/cime_config/machines/Depends.gnugpu.cmake b/cime_config/machines/Depends.gnugpu.cmake
index e75fe5dbdaec..087feda541b2 100644
--- a/cime_config/machines/Depends.gnugpu.cmake
+++ b/cime_config/machines/Depends.gnugpu.cmake
@@ -11,19 +11,11 @@ if (NOT DEBUG)
   endif()
 endif()
 
-list(APPEND ALLOW_INVALID_BOZ_LIST
-  eam/src/control/cam_history.F90
-  elm/src/biogeochem/MEGANFactorsMod.F90
-)
 list(APPEND NO_INLINE_ARG_PACKING_LIST
   eam/src/dynamics/se/inidat.F90
 )
 
 if (CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 10)
-  foreach(ITEM IN LISTS ALLOW_INVALID_BOZ_LIST)
-    e3sm_add_flags("${ITEM}" "-fallow-invalid-boz") # avoids build error for integer, parameter :: gen_hash_key_offset = z'000053db'
-  endforeach()
-
   if (NOT DEBUG)
     # new in gnu10, inline arg packing was causing INF values with SMS_P4x1.ne4pg2_ne4pg2.F-MMFXX
     foreach(ITEM IN LISTS NO_INLINE_ARG_PACKING_LIST)
diff --git a/cime_config/machines/cmake_macros/gnu_anlgce-ub18.cmake b/cime_config/machines/cmake_macros/gnu_anlgce-ub18.cmake
index d2d0c4ff4df8..be997d160315 100644
--- a/cime_config/machines/cmake_macros/gnu_anlgce-ub18.cmake
+++ b/cime_config/machines/cmake_macros/gnu_anlgce-ub18.cmake
@@ -5,7 +5,6 @@ string(APPEND CXX_LIBS " -lstdc++")
 if (NOT DEBUG)
   string(APPEND FFLAGS " -O2")
 endif()
-string(APPEND FFLAGS " -fallow-argument-mismatch -fallow-invalid-boz")
 execute_process(COMMAND $ENV{NETCDF_PATH}/bin/nf-config --flibs OUTPUT_VARIABLE SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE0 OUTPUT_STRIP_TRAILING_WHITESPACE)
 execute_process(COMMAND $ENV{NETCDF_PATH}/bin/nc-config --libs OUTPUT_VARIABLE SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE1 OUTPUT_STRIP_TRAILING_WHITESPACE)
 string(APPEND SLIBS " ${SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE0} ${SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE1} -lblas -llapack")
diff --git a/cime_config/machines/cmake_macros/gnu_anlgce.cmake b/cime_config/machines/cmake_macros/gnu_anlgce.cmake
index d2d0c4ff4df8..be997d160315 100644
--- a/cime_config/machines/cmake_macros/gnu_anlgce.cmake
+++ b/cime_config/machines/cmake_macros/gnu_anlgce.cmake
@@ -5,7 +5,6 @@ string(APPEND CXX_LIBS " -lstdc++")
 if (NOT DEBUG)
   string(APPEND FFLAGS " -O2")
 endif()
-string(APPEND FFLAGS " -fallow-argument-mismatch -fallow-invalid-boz")
 execute_process(COMMAND $ENV{NETCDF_PATH}/bin/nf-config --flibs OUTPUT_VARIABLE SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE0 OUTPUT_STRIP_TRAILING_WHITESPACE)
 execute_process(COMMAND $ENV{NETCDF_PATH}/bin/nc-config --libs OUTPUT_VARIABLE SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE1 OUTPUT_STRIP_TRAILING_WHITESPACE)
 string(APPEND SLIBS " ${SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE0} ${SHELL_CMD_OUTPUT_BUILD_INTERNAL_IGNORE1} -lblas -llapack")
diff --git a/cime_config/machines/cmake_macros/gnu_docker-scream.cmake b/cime_config/machines/cmake_macros/gnu_docker-scream.cmake
index eb95c7113ce7..713260895c9c 100644
--- a/cime_config/machines/cmake_macros/gnu_docker-scream.cmake
+++ b/cime_config/machines/cmake_macros/gnu_docker-scream.cmake
@@ -66,6 +66,3 @@ set(SCC "/opt/conda/bin/x86_64-conda-linux-gnu-gcc")
 set(SCXX "/opt/conda/bin/x86_64-conda-linux-gnu-g++")
 set(SFC "/opt/conda/bin/x86_64-conda-linux-gnu-gfortran")
 set(SUPPORTS_CXX "TRUE")
-if (CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 10)
-  string(APPEND FFLAGS " -fallow-argument-mismatch  -fallow-invalid-boz ")
-endif()
diff --git a/cime_config/machines/cmake_macros/gnu_eddi.cmake b/cime_config/machines/cmake_macros/gnu_eddi.cmake
index 4318ecd7e224..9233b9a86846 100644
--- a/cime_config/machines/cmake_macros/gnu_eddi.cmake
+++ b/cime_config/machines/cmake_macros/gnu_eddi.cmake
@@ -4,10 +4,10 @@ if (COMP_NAME STREQUAL gptl)
 endif()
 set(NETCDF_PATH "$ENV{NETCDF_HOME}")
 if (NOT DEBUG)
-  string(APPEND FFLAGS " -fno-unsafe-math-optimizations -fallow-argument-mismatch -fallow-invalid-boz")
+  string(APPEND FFLAGS " -fno-unsafe-math-optimizations ")
 endif()
 if (DEBUG)
-  string(APPEND FFLAGS " -g -fbacktrace -fbounds-check -ffpe-trap=invalid,zero,overflow -fallow-argument-mismatch -fallow-invalid-boz -Wall")
+  string(APPEND FFLAGS " -g -fbacktrace -fbounds-check -ffpe-trap=invalid,zero,overflow -Wall")
 endif()
 string(APPEND SLIBS " -L$ENV{NETCDF_HOME}/lib/ -lnetcdff -lnetcdf -lcurl -llapack -lblas")
 if (MPILIB STREQUAL mpi-serial)
diff --git a/cime_config/machines/cmake_macros/gnu_spock.cmake b/cime_config/machines/cmake_macros/gnu_spock.cmake
index 72278098ab7c..a100d549b737 100644
--- a/cime_config/machines/cmake_macros/gnu_spock.cmake
+++ b/cime_config/machines/cmake_macros/gnu_spock.cmake
@@ -1,5 +1,5 @@
 set(SUPPORTS_CXX "TRUE")
-string(APPEND FFLAGS " -fallow-argument-mismatch -Wno-implicit-interface -fallow-invalid-boz ")
+string(APPEND FFLAGS " -Wno-implicit-interface ")
 string(APPEND CXX_LIBS " -lstdc++")
 if (NOT DEBUG)
   string(APPEND FFLAGS " -O2")
diff --git a/components/eam/src/control/cam_history.F90 b/components/eam/src/control/cam_history.F90
index b586d9317edb..c1b66c734d4e 100644
--- a/components/eam/src/control/cam_history.F90
+++ b/components/eam/src/control/cam_history.F90
@@ -260,7 +260,7 @@ module cam_history
   !        logic in the routine that optimizes character strings of length 8.
   !
 
-  integer, parameter :: gen_hash_key_offset = z'000053db'
+  integer, parameter :: gen_hash_key_offset = int(z'000053db')
 
   integer, parameter :: tbl_max_idx = 15  ! 2**N - 1
   integer, dimension(0:tbl_max_idx) :: tbl_gen_hash_key = &
diff --git a/components/elm/src/biogeochem/MEGANFactorsMod.F90 b/components/elm/src/biogeochem/MEGANFactorsMod.F90
index e266e462d04f..38056b6429ef 100644
--- a/components/elm/src/biogeochem/MEGANFactorsMod.F90
+++ b/components/elm/src/biogeochem/MEGANFactorsMod.F90
@@ -268,7 +268,7 @@ integer function gen_hashkey(string)
     integer :: i
 
     integer, parameter :: tbl_max_idx = 15  ! 2**N - 1
-    integer, parameter :: gen_hash_key_offset = z'000053db'
+    integer, parameter :: gen_hash_key_offset = int(z'000053db')
     integer, dimension(0:tbl_max_idx) :: tbl_gen_hash_key =  (/61,59,53,47,43,41,37,31,29,23,17,13,11,7,3,1/)
 
     hash = gen_hash_key_offset