diff --git a/Source/Makefile.in b/Source/Makefile.in
index 61a2fb625..25980434b 100644
--- a/Source/Makefile.in
+++ b/Source/Makefile.in
@@ -3,7 +3,7 @@ VPATH         = @srcdir@
 
 CMAKE_CONFIG_DIR = @CMAKE_CONFIG_DIR@
 CXX           = @CXX@
-CXXFLAGS      = -DCMAKE_ROOT_DIR='"@CMAKE_ROOT_DIR@"' @CXXFLAGS@ -DCMAKE_HAS_AUTOCONF -I${CMAKE_CONFIG_DIR}/Source
+CXXFLAGS      =  @CMAKE_ANSI_CFLAGS@ -DCMAKE_ROOT_DIR='"@CMAKE_ROOT_DIR@"' @CXXFLAGS@ -DCMAKE_HAS_AUTOCONF -I${CMAKE_CONFIG_DIR}/Source
 
 .SUFFIXES: .cxx .java .class