--- a/old-configure.in
+++ b/old-configure.in
@@ -668,17 +668,19 @@ dnl ====================================
 if test -n "${CLANG_CC}${CLANG_CL}"; then
     _WARNINGS_CFLAGS="-Qunused-arguments ${_WARNINGS_CFLAGS}"
     CPPFLAGS="-Qunused-arguments ${CPPFLAGS}"
 fi
 if test -n "${CLANG_CXX}${CLANG_CL}"; then
     _WARNINGS_CXXFLAGS="-Qunused-arguments ${_WARNINGS_CXXFLAGS}"
 fi
 
-MOZ_CONFIG_SANITIZE
+if test -n "$COMPILE_ENVIRONMENT"; then
+   MOZ_CONFIG_SANITIZE
+fi
 
 dnl ========================================================
 dnl = Enable treating compiler warnings as errors
 dnl ========================================================
 MOZ_ARG_ENABLE_BOOL(warnings-as-errors,
 [  --enable-warnings-as-errors
                           Enable treating warnings as errors],
     MOZ_ENABLE_WARNINGS_AS_ERRORS=1,