diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3f9c96b1d..b705d7bcd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ PROJECT(CMake)
 
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
-     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -tweak -no_implicit_include ")
+     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
   ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
 
diff --git a/Tests/Complex/CMakeLists.txt b/Tests/Complex/CMakeLists.txt
index 9eefd8b1e..0549c6f11 100644
--- a/Tests/Complex/CMakeLists.txt
+++ b/Tests/Complex/CMakeLists.txt
@@ -14,7 +14,7 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
-     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -tweak -no_implicit_include ")
+     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
   ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
 
diff --git a/Tests/ComplexOneConfig/CMakeLists.txt b/Tests/ComplexOneConfig/CMakeLists.txt
index 9eefd8b1e..0549c6f11 100644
--- a/Tests/ComplexOneConfig/CMakeLists.txt
+++ b/Tests/ComplexOneConfig/CMakeLists.txt
@@ -14,7 +14,7 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
-     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -tweak -no_implicit_include ")
+     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
   ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
 
diff --git a/Tests/ComplexRelativePaths/CMakeLists.txt b/Tests/ComplexRelativePaths/CMakeLists.txt
index 9eefd8b1e..0549c6f11 100644
--- a/Tests/ComplexRelativePaths/CMakeLists.txt
+++ b/Tests/ComplexRelativePaths/CMakeLists.txt
@@ -14,7 +14,7 @@ ENDIF (CMAKE_ANSI_CXXFLAGS)
 
 IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   IF(NOT CMAKE_COMPILER_IS_GNUCXX)
-     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -tweak -no_implicit_include ")
+     SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -timplicit_local -no_implicit_include ")
   ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)
 ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V.*")