diff --git a/Modules/CMakeFortranCompiler.cmake.in b/Modules/CMakeFortranCompiler.cmake.in
index 67a0c64a1..65cfda7a9 100644
--- a/Modules/CMakeFortranCompiler.cmake.in
+++ b/Modules/CMakeFortranCompiler.cmake.in
@@ -19,7 +19,7 @@ IF(CMAKE_COMPILER_IS_MINGW)
   SET(MINGW 1)
 ENDIF(CMAKE_COMPILER_IS_MINGW)
 SET(CMAKE_Fortran_COMPILER_ID_RUN 1)
-SET(CMAKE_Fortran_SOURCE_FILE_EXTENSIONS f;F;f77;F77;f90;F90;for;f95;F95)
+SET(CMAKE_Fortran_SOURCE_FILE_EXTENSIONS f;F;f77;F77;f90;F90;for;For;FOR;f95;F95)
 SET(CMAKE_Fortran_IGNORE_EXTENSIONS h;H;o;O;obj;OBJ;def;DEF;rc;RC)
 SET(CMAKE_Fortran_LINKER_PREFERENCE 20)
 IF(UNIX)