diff --git a/Modules/CMakeCInformation.cmake b/Modules/CMakeCInformation.cmake
index 578aff9a1..86a824a76 100644
--- a/Modules/CMakeCInformation.cmake
+++ b/Modules/CMakeCInformation.cmake
@@ -26,6 +26,8 @@ ELSE(UNIX)
   SET(CMAKE_C_OUTPUT_EXTENSION .obj)
 ENDIF(UNIX)
 
+SET(_INCLUDED_FILE 0)
+
 # Load compiler-specific information.
 IF(CMAKE_C_COMPILER_ID)
   INCLUDE(Compiler/${CMAKE_C_COMPILER_ID}-C OPTIONAL)
diff --git a/Modules/CMakeCXXInformation.cmake b/Modules/CMakeCXXInformation.cmake
index 869894c13..680f8fdbd 100644
--- a/Modules/CMakeCXXInformation.cmake
+++ b/Modules/CMakeCXXInformation.cmake
@@ -26,6 +26,8 @@ ELSE(UNIX)
   SET(CMAKE_CXX_OUTPUT_EXTENSION .obj)
 ENDIF(UNIX)
 
+SET(_INCLUDED_FILE 0)
+
 # Load compiler-specific information.
 IF(CMAKE_CXX_COMPILER_ID)
   INCLUDE(Compiler/${CMAKE_CXX_COMPILER_ID}-CXX OPTIONAL)
diff --git a/Modules/CMakeFortranInformation.cmake b/Modules/CMakeFortranInformation.cmake
index cdb8038aa..f6a52c6eb 100644
--- a/Modules/CMakeFortranInformation.cmake
+++ b/Modules/CMakeFortranInformation.cmake
@@ -16,6 +16,8 @@
 # It also loads the available platform file for the system-compiler
 # if it exists.
 
+SET(_INCLUDED_FILE 0)
+
 # Load compiler-specific information.
 IF(CMAKE_Fortran_COMPILER_ID)
   INCLUDE(Compiler/${CMAKE_Fortran_COMPILER_ID}-Fortran OPTIONAL)