diff --git a/CHANGES.current b/CHANGES.current
index d7564e1b6..c99273c28 100644
--- a/CHANGES.current
+++ b/CHANGES.current
@@ -7,8 +7,11 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2020-10-19: wsfulton
+            #1610 Remove -ansi from default compilation flags.
+
 2021-03-19: dot-asm
-            #1934 [Java] Clean up typemaps for long long arrays
+            #1934 [Java] Clean up typemaps for long long arrays.
 
 2021-03-19: olly
 	    #1527 [PHP] Improve PHP object creation in directorin case.
diff --git a/Tools/config/ac_compile_warnings.m4 b/Tools/config/ac_compile_warnings.m4
index 7e4239a3c..04f146387 100644
--- a/Tools/config/ac_compile_warnings.m4
+++ b/Tools/config/ac_compile_warnings.m4
@@ -34,7 +34,7 @@ AC_MSG_CHECKING([maximum warning verbosity option])
     then
       if test "$GXX" = "yes"
       then
-        ac_compile_warnings_opt='-Wall -W -ansi -pedantic'
+        ac_compile_warnings_opt='-Wall -W -pedantic'
       fi
       CXXFLAGS="$CXXFLAGS $ac_compile_warnings_opt"
       ac_compile_warnings_msg="$ac_compile_warnings_opt for C++"
@@ -44,7 +44,7 @@ AC_MSG_CHECKING([maximum warning verbosity option])
   then
     if test "$GCC" = "yes"
     then
-      ac_compile_warnings_opt='-Wall -W -ansi -pedantic'
+      ac_compile_warnings_opt='-Wall -W -pedantic'
     fi
     CFLAGS="$CFLAGS $ac_compile_warnings_opt"
     ac_compile_warnings_msg="$ac_compile_warnings_msg $ac_compile_warnings_opt for C"