diff --git a/.travis.yml b/.travis.yml
index be0f23c..86f426f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -282,7 +282,7 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - ./b2 -j3 libs/endian/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
+  - ./b2 -j3 libs/endian/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release warnings=all warnings-as-errors=on ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
 
 notifications:
   email:
diff --git a/appveyor.yml b/appveyor.yml
index cfb9a1b..61e5327 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -51,4 +51,4 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j3 libs/endian/test toolset=%TOOLSET% %CXXSTD%
+  - b2 -j3 libs/endian/test toolset=%TOOLSET% %CXXSTD% variant=debug,release warnings=all warnings-as-errors=on