diff --git a/config/cmake/HDFFortranCompilerFlags.cmake b/config/cmake/HDFFortranCompilerFlags.cmake
index e08df05c52d..8ac3b7826f2 100644
--- a/config/cmake/HDFFortranCompilerFlags.cmake
+++ b/config/cmake/HDFFortranCompilerFlags.cmake
@@ -51,6 +51,10 @@ if (CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" AND NOT CMAKE_Fortran_COMPILER_VERS
     set (CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdiagnostics-urls=never -fno-diagnostics-color")
   endif ()
 endif ()
+if (CMAKE_Fortran_COMPILER_ID STREQUAL "NAG")
+    message (STATUS "... Select IEEE floating-point mode full")
+    list (APPEND HDF5_CMAKE_Fortran_FLAGS "-ieee=full")
+endif ()
 
 if (CMAKE_Fortran_COMPILER_ID STREQUAL "NAG")
     message (STATUS "... Select IEEE floating-point mode full")